This file geodatabase includes the following individual layers:

Lake Bathymetric Contours: Contours lines corresponding to lake bathymetry, digitized from existing lake contour maps produced by the DNR Ecological Services Lake Mapping Unit. Use in combination with other Lake Bathymetric GIS products. Classify and label contour lines with depth values. Convert to polygons and calculate lake surface area for each depth interval. Overlay onto bathymetric DEM shaded relief image.

Lake Bathymetric Digital Elevation Model (DEM): A digital elevation model (DEM) representing lake bathymetry. Cell size is most often 5m, although 10m cells were used for some lakes to reduce grid file size. This grid contains one attribute DEPTH that represents lake depth in (negative) feet. Use in combination with other Lake Bathymetric GIS products. Reclassify DEM based on various depth intervals. Calculate zonal and neighborhood statistics. Derive slope surface. Model depth data with other cell-based parameters (e.g., slope, vegetation, substrate, chemistry) to predict habitat suitability, functional niches, etc. (Note: These raster analyses require Spatial Analyst or Arc Grid.)

Lake Bathymetric Outline: Lake outline as digitized from 1991-92 aerial photography (1m DOQ's). Use in combination with other Lake Bathymetric GIS products. Overlay onto bathymetric contour lines and bathymetric DEM shaded relief image.

Lake Bathymetric Metadata: Metadata for the Lake Bathymetry layers. Each lake is represented by a polygon. The polygon attributes contain information about when the bathymetry fieldwork was completed. This layer can be used to query for bathymetry created on or between certain dates, or to ascertain what date a particular lake was investigated. The dates are in a text field. Date formats vary from record to record.

The lake mapping program was developed as a cooperative initiative between the Nebraska Game and Parks Commission and the U.S. Bureau of Reclamation (BOR) to provide detailed survey information on Nebraska's lakes and reservoirs. Each year a list of proposed lakes and reservoirs is submitted by biologists across the state and reviewed by a committee to determine the lakes of highest priority. A number of factors are taken into consideration including Aquatic Habitat Projects, lake conditions, fish communities, and angler use. The overall goal of the program is to provide fisheries managers with detailed information to be used in management and monitoring of Nebraska's lakes. Detailed bathymetric lake maps are also produced and made available to the public on the NGPC web site.

Archives at the Institute for Fisheries Research (IFR) hold records of thousands of lake surveys from the University of Michigan and Michigan Department of Natural Resources. The records contained in this dataset are jpeg images of the index card records from the IFR surveys. Images include the front of the card and when available, the back of a card. ;Lake Mapping Record Cards contain drawings of lakes with depth contours (bathymetry), as well as other features like bottom substrate, vegetation, and shore features.

THIS MAP IS NOT AUTHORITATIVE. SEE TERMS OF USE BELOW.This web map was developed by the National Oceanic and Atmospheric Administration’s (NOAA) Office for Coastal Management and is featured in the U.S. Great Lakes Collaborative Benthic Habitat Mapping Common Operating Dashboard in support of the Collaborative Benthic Habitat Mapping in the Nearshore Waters of the Great Lakes Basin Project. This multi-year, multi-agency project is funded through the Great Lakes Restoration Initiative (GLRI) and focuses on new bathymetric data (airborne lidar and vessel based sonar) acquisition, validation, and benthic habitat characterization mapping of the nearshore waters (0-80 meters) in the U.S. Great Lakes. This project also contributes to the regional Lakebed 2030 campaign, which aims to have high-density bathymetric data available for the entirety of the Great Lakes by 2030. This web map contains data layers reflecting the current status of bathy data coverage in the nearshore (0-80 meters) of the U.S. Great Lakes, including acquisition (lidar and multibeam sonar), ground-truthing/validation, and benthic habitat mapping and characterization. Acquisition layers include coverage areas that have been acquired and are available for public use (green) as well as those that have been acquired, but are not yet available or are still in progress (orange). The nearshore water depth layers (0-25 and 25-80 meters) were created using the National Centers for Environmental Information (NCEI) Great Lakes Bathymetry (3-second resolution) grid extracts. The 0 to 25 meter nearshore water depth layer represents areas where bathymetric lidar data acquisition could ideally be conducted, depending on water condition and turbidity. The 25 to 80 meter layer shows locations where acoustic data acquisition can occur. See below for information on additional data layers. All data originally projected in the following coordinate system: EPSG:3175, NAD 1983 Great Lakes and St Lawrence Albers.This map will continue to be updated as new information is made available.Source Data for Bathy Coverage Layers - Acquired/Available:Topobathy and Bathy Lidar (NOAA's Data Access Viewer: https://coast.noaa.gov/dataviewer/#/; U.S. Interagency Elevation Inventory (USIEI): https://coast.noaa.gov/inventory/). Multibeam Sonar (National Centers for Environmental Information (NCEI) Bathymetric Data Viewer: https://www.ncei.noaa.gov/maps/bathymetry/; NOAA's Data Access Viewer: https://coast.noaa.gov/dataviewer/#/; U.S. Interagency Elevation Inventory (USIEI): https://coast.noaa.gov/inventory/; USGS ScienceBaseCatalog: https://www.sciencebase.gov/catalog/item/656e229bd34e7ca10833f950)Source Data for Bathy Coverage Layers - GLRI AOIs (2020-2024):Acquisition: NOAA Office for Coastal ManagementValidation/CMECS Characterizations: NOAA National Centers for Coastal Ocean Science (NCCOS)Source Data for Bathy Coverage Layers - In Progress and Planned:NOAA Office of Coast Survey Plans: https://gis.charttools.noaa.gov/arcgis/rest/services/Hydrographic_Services/Planned_Survey_Areas/MapServer/0NOAA Office for Coastal ManagementSource Data for Nearshore Water Depths:NOAA's National Centers for Environmental Information (NCEI) Great Lakes Bathymetry (3-second resolution) grid extracts: https://www.ncei.noaa.gov/maps/grid-extract/Source Data for Spatial Prioritization Layers:Great Lakes Spatial Priorities Study Results Jun 2021. https://gis.charttools.noaa.gov/arcgis/rest/services/IOCM/GreatLakes_SPS_Results_Jun_2021/MapServerMapping priorities within the proposed Wisconsin Lake Michigan National Marine Sanctuary (2018). https://gis.ngdc.noaa.gov/arcgis/rest/services/nccos/BiogeographicAssessments_WILMPrioritizationResults/MapServerThunder Bay National Marine Sanctuary Spatial Prioritization Results (2020). https://gis.ngdc.noaa.gov/arcgis/rest/services/nccos/BiogeographicAssessments_TBNMSPrioritizationResults/MapServerSource Data for Supplemental Data Layers:International Boundary Commission U.S./Canada Boundary (version 1.3 from 2018): https://www.internationalboundarycommission.org/en/maps-coordinates/coordinates.phpNational Oceanic and Atmospheric Administration (NOAA) HydroHealth 2018 Survey: https://wrecks.nauticalcharts.noaa.gov/arcgis/rest/services/Hydrographic_Services/HydroHealth_2018/ImageServerNational Oceanic and Atmospheric Administration (NOAA) Marine Protected Areas (MPA) Inventory 2023-2024: https://www.fisheries.noaa.gov/inport/item/69506National Oceanic and Atmospheric Administration (NOAA) National Marine Sanctuary Program Boundaries (2021): https://services2.arcgis.com/C8EMgrsFcRFL6LrL/arcgis/rest/services/ONMS_2021_Boundaries/FeatureServerNational Oceanic and Atmospheric Administration (NOAA) U.S. Bathymetry Gap Analysis: https://noaa.maps.arcgis.com/home/item.html?id=4d7d925fc96d47d9ace970dd5040df0aU.S. Environment Protection Agency (EPA) Areas of Concern: https://services.arcgis.com/cJ9YHowT8TU7DUyn/arcgis/rest/services/epa_areas_of_concern_glahf_viewlayer/FeatureServerU.S. Geological Survey (USGS) Great Lakes Subbasins: https://www.sciencebase.gov/catalog/item/530f8a0ee4b0e7e46bd300dd Latest update: February 20, 2025

The lake mapping market is projected to reach a market size of XX million USD by 2033, exhibiting a CAGR of XX% between 2025 and 2033. Growing environmental concerns, increasing demand for resource management, and advancements in technology are driving the growth of the market. The market is segmented into application, types, and region. North America and Europe are expected to remain dominant regions, while Asia Pacific is expected to grow at the highest CAGR during the forecast period. Key players in the lake mapping market include SOLitude Lake Management, Aquatic Environment Consultants, Diversified Waterscapes, Florida Waterways, Jones Lake Management, Aquatic Control, Aqua Link, Ponds, Aqua Sierra, LakeTech, Johnson Lake Management, MOUNTAIN TOWN MAINTENANCE, and Aquatic Weed Control. These companies are focusing on offering innovative solutions and expanding their geographical presence to cater to the growing demand from various end-use industries. Strategic collaborations and mergers and acquisitions are also expected to shape the future of the market. The Lake Mapping Service market is projected to reach USD 250 million by 2028, from USD 156.24 million in 2023, at a CAGR of 6.4% during the forecast period.

Lake Mapping and Bathymetry Market Outlook

The global lake mapping and bathymetry market size was valued at approximately USD 1.2 billion in 2023 and is projected to reach USD 2.8 billion by 2032, growing at a CAGR of 9.6% over the forecast period. This significant growth is propelled by increasing demand for precise aquatic mapping and monitoring, driven by urgent needs in environmental conservation, water resource management, and enhanced navigation safety. Factors such as technological advancements in sonar and LiDAR systems, escalating concerns about water conservation, and the growing importance of aquatic ecosystems in maintaining biodiversity are pivotal to the market's expansion.

A key growth factor is the heightened awareness and regulatory requirements surrounding water conservation and aquatic habitat preservation. Governments and environmental agencies worldwide are investing heavily in technologies that facilitate accurate lake and riverbed mapping to ensure compliance with environmental protection regulations. This investment is not only focused on preserving biodiversity but also on understanding the impacts of climate change on water bodies. As a result, the demand for advanced mapping technologies such as sonar and LiDAR has intensified, as they provide high-resolution data critical for informed decision-making.

Another driving force behind the market's growth is the technological advancements in sonar, LiDAR, and satellite systems, which have revolutionized the precision and efficiency of bathymetric surveys. These technologies allow for comprehensive and accurate underwater topography mapping, which is crucial for various applications including environmental monitoring, navigation, and water resource management. The integration of artificial intelligence and machine learning with these technologies further enhances data processing capabilities, providing real-time insights and predictive analytics that are invaluable for managing water resources effectively.

Moreover, the increasing importance of inland water bodies in supporting local economies and providing recreational opportunities has led to a surge in demand for detailed mapping and bathymetric services. Local governments and municipalities are keen to harness these resources sustainably, which necessitates detailed topographical and ecological assessments of lakes and rivers. This trend is coupled with the growing public interest in outdoor and water-based activities, driving a need for enhanced safety and navigation solutions, thereby creating further opportunities for market growth.

Hydrographic Survey plays a crucial role in the lake mapping and bathymetry market by providing detailed and accurate data on underwater topography. This type of survey is essential for understanding the physical characteristics of water bodies, which is vital for applications such as navigation, environmental monitoring, and resource management. Hydrographic surveys utilize advanced technologies like sonar and LiDAR to map the underwater environment, offering insights into depth variations, sediment composition, and potential hazards. These surveys are indispensable for ensuring safe navigation, particularly in areas with complex underwater landscapes, and for supporting environmental conservation efforts by providing data necessary for habitat preservation and pollution assessment. As the demand for precise aquatic mapping continues to grow, the role of hydrographic surveys becomes increasingly significant in facilitating informed decision-making and sustainable management of water resources.

Regionally, North America and Europe currently dominate the lake mapping and bathymetry market, attributed to their advanced technological infrastructure and strong focus on environmental sustainability. However, the Asia Pacific region is expected to witness the fastest growth during the forecast period, driven by rapid urbanization, increasing population, and growing concerns over water scarcity and environmental degradation. Emerging economies in Asia Pacific are increasingly investing in sophisticated technologies for water resource management and environmental monitoring, which is anticipated to bolster market growth in the region.

Technology Analysis

In the realm of lake mapping and bathymetry, technology serves as the backbone enabling precise and efficient data collection and analysis. Among the technologies utilized, sonar systems stand out for their ability to provide detailed unde

Lakes were mapped based on Landsat mosaics from 2001/2002 and 2009. Maps are stored as ESRI shapefile. Projection: UTM 52N, Datum: WGS84, Extent: South-bound Latitude: 60.40 * West-bound Longitude: 113.00 * North-bound Latitude: 65.60 * East-bound Longitude: 133.40 Methods: Waterbody mapping was carried out using two mosaics of Landsat satellite images: A Landsat TM mosaic consisting of 25 images acquired during the summer of 2009 and a mosaic of 31 Landsat ETM+ images recorded during two consecutive summers in 2001 (12 images) and 2002 (19 images). Heavy cloud cover in 2001 and 2002 made it necessary to combine remote sensing data from these two years in order to create a cloud free baseline for change detection over the entire region covered by the (cloud-free) 2009 mosaic. The average day of year (DOY) for the 12 images in our 2001 dataset was therefore 213 ±19 (1st August), and for the 19 images in the 2002 dataset 212 ±15 (31st July). Precipitation, which is likely to affect the areas of lakes, did not vary between these two years. The average DOY of our 2009 dataset was 215 ±20 (3rd August) and was therefore comparable to the 2001-2002 baseline. Visual accuracy assessments were carried out on the water classifications (especially along overgrown lake margins), taking into account the extent of misclassifications due to shadows from clouds or mountains. We therefore did not apply any radiometric normalization during the mosaic-making process, in order to retain the original digital number (DN) values. Several classification iterations and subsequent visual inspections showed that Landsat's short wave infrared band 5, which has the same wavelength (1.55 - 1.75 µm) in both the TM and the ETM+ missions, provides the best results for surface water mapping. Characteristic for Landsat band 5 is the very high water absorption making it suitable for water detection. We therefore reclassified a narrow empirical DN value domain of high absorption (from 1 to 20, out of possible 256 DN, where higher values indicate higher reflectance) within this band as mapped water bodies. However, due to the absence of any independent control dataset for water bodies, we were unable to calculate accuracy statistics. A filter algorithm with a 3-by-3 opening was used to smooth the contours and remove small holes and fringes in the grid mask, especially along lake margins and in areas of shallow water. This operation significantly reduced the number of small water bodies but without having any major impact on the calculated total area covered by lakes. The filtered raster data was vectorized in order to calculate the total area covered by lakes and any changes in this area over time, and also to investigate relationships between changes in lake area and changes in lake topology. Floodplain lakes located close to river meanders showed highly dynamic surface areas that changed because of river water level fluctuations, and these were therefore removed manually. Only lakes with a size greater than or equal to 4 Landsat pixels were considered for further analysis.

The lake mapping service market is experiencing robust growth, driven by increasing concerns about water resource management, ecological preservation, and the impacts of climate change. The market, estimated at $2 billion in 2025, is projected to expand at a Compound Annual Growth Rate (CAGR) of 7% from 2025 to 2033, reaching a value exceeding $3.5 billion. This expansion is fueled by several key factors. Firstly, the rising adoption of advanced technologies such as aerial photography, satellite imagery, and LiDAR is enabling more precise and detailed lake mapping, providing valuable data for various applications. Secondly, governmental initiatives focused on environmental monitoring and water resource management are creating a significant demand for these services, particularly in regions facing water scarcity or experiencing ecological degradation. The market is segmented by application (environmental monitoring, resource management, ecological studies, others) and type (aerial photography, satellite imagery, others), with environmental monitoring and resource management currently dominating the applications segment. North America and Europe are currently the leading regional markets, benefiting from robust environmental regulations and higher technological adoption rates. However, developing regions in Asia-Pacific and South America are expected to witness significant growth in the coming years due to increasing infrastructure development and growing awareness of water resource conservation. Despite the positive outlook, the market faces challenges. The high initial investment cost of equipment and software, coupled with the specialized expertise required for data analysis and interpretation, can pose barriers to entry for new market players. Moreover, variations in weather conditions and geographical accessibility can impact data acquisition and potentially increase project costs. However, the ongoing development of more efficient and cost-effective technologies, coupled with increasing government support for environmental projects, is expected to mitigate these challenges. Competitive landscape analysis reveals a fragmented market with numerous established players and emerging companies. Companies offering specialized services, coupled with advanced analytical capabilities, are likely to gain a strong competitive edge in this rapidly evolving market.

The lake mapping service market is experiencing robust growth, driven by increasing concerns about water resource management, ecological preservation, and the need for precise environmental monitoring. The market's expansion is fueled by advancements in remote sensing technologies, particularly aerial photography and satellite imagery, which offer cost-effective and efficient solutions for detailed lake mapping. Applications span diverse sectors, including environmental monitoring (assessing water quality, pollution levels, and algal blooms), resource management (optimizing water usage and infrastructure planning), and ecological studies (analyzing habitat changes and biodiversity). While precise market sizing data is unavailable, considering the strong growth drivers and the increasing adoption of these technologies across various geographies, a conservative estimate for the 2025 market size would be around $500 million, with a Compound Annual Growth Rate (CAGR) of approximately 12% projected through 2033. This growth is further supported by the increasing demand for accurate data to manage and protect valuable lake ecosystems, particularly in regions facing water scarcity and environmental challenges. The North American market currently holds a significant share, driven by substantial investments in environmental monitoring and resource management programs. However, significant growth potential exists in other regions like Asia Pacific, particularly in countries experiencing rapid urbanization and industrialization, leading to increased pressure on water resources. While the market faces certain restraints such as the high initial investment in technology and skilled personnel, the long-term benefits of accurate lake mapping far outweigh these challenges. The increasing availability of data analytics tools and cloud-based platforms is also contributing to market growth by making lake mapping data more accessible and easier to interpret. Furthermore, government regulations and policies promoting sustainable water management are further accelerating the adoption of lake mapping services. The market is segmented by application (environmental monitoring, resource management, ecological studies, and others) and by type (aerial photography, satellite imagery, and others). The increasing use of advanced analytics and integration with GIS platforms are key trends shaping the future of this growing market.

Glacial lake dataset for paper "Efficient glacial lake mapping by leveraging deep transfer learning and a new annotated glacial lake dataset"

The GLID dataset contains a total of 18,367 samples, and the size of each sample is 512*512. Each sample consists of an image and a corresponding label. Four glacial lake types including supraglacial lake, proglacial lake, ice-marginal lake, and unconnected glacial lake are involved. The pixel value of the glacier lake in annotation map is labeled 255 and background is labeled 0.

GLID.rar contains the training dataset (16,000 samples), and val.zip contains the validation dataset (2,367 samples).

Any standing body of fresh inland water.

Data Dictionary for lake_poly: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-lake_poly.html

This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.

Further information on Topo50: http://www.linz.govt.nz/topography/topo-maps/topo50

APIs and web services

This dataset is available via ArcGIS Online and ArcGIS REST services, as well as our standard APIs. LDS APIs and OGC web services ArcGIS Online map services

See full Data Guide here. Lake Bathymetry describes the water depth for selected reservoirs, lakes, ponds, and coves in Connecticut. It includes depth contours, also called bathymetric contours, that define lines of equal water depth in feet. This information was collected and compiled by the State of Connecticut, Department of Environmental Protection over a period of time using a variety of different techniques and equipment including manual depth soundings, use of an electronic depth sounder in conjunction with a GPS receiver to locate the boat, and digitizing previously published bathymetry maps. Data is compiled at a variety of scales and resolutions, depending on the collection method used for a particular waterbody. A list of the waterbodies included in this layer can be viewed in the GIS Metadata for Lake Bathymetry. This information was used to publish bathymetric maps in A Fisheries Guide to Lakes and Ponds of Connecticut, Robert P. Jacobs, Eileen B. O'Donnell, and William B. Gerrish, Connecticut Department of Environmental Protection Bulletin 35, 2002, SBN 0-942085-11-6.

Layer showing shoreline boundaries for selected lakes and reservoirs in Nebraska where bathymetric surveys were conducted. This feature class is mainly to show the waters' edge in the context of bathymetric lake mapping. The lake mapping program was developed as a cooperative initiative between the Nebraska Game and Parks Commission and the U.S. Bureau of Reclamation (BOR) to provide detailed survey information on Nebraska's lakes and reservoirs. Each year a list of proposed lakes and reservoirs is submitted by biologists across the state and reviewed by a committee to determine the lakes of highest priority. A number of factors are taken into consideration including Aquatic Habitat Projects, lake conditions, fish communities, and angler use. The overall goal of the program is to provide fisheries managers with detailed information to be used in management and monitoring of Nebraska's lakes. Detailed bathymetric lake maps are also produced and made available to the public on the NGPC web site.This shoreline data provides the outline of the lakes surveyed and contains information detailing when and where the survey was collected and how the bathymetric data was processed. The shoreline data is representative of the lakes that have been surveyed for bathymetric contours. Lakes that have not been surveyed are not part of this feature class, you may find the remaining waterbodies as well as these in the RecreationWaters dataset under PublicFishingAreas feature class.

The lake mapping and bathymetry market is experiencing robust growth, driven by increasing demand for accurate lake data for various applications. This demand stems from heightened environmental awareness, stricter regulatory compliance requirements for water resource management, and the expanding adoption of advanced technologies like LiDAR and sonar for more precise and efficient data acquisition. The market's expansion is further fueled by the growing need for comprehensive lake assessments to support effective lake management strategies, including erosion control, invasive species management, and habitat restoration projects. Key players in this market are leveraging technological advancements and strategic partnerships to expand their service offerings and geographical reach, leading to increased competition and market consolidation. The rising popularity of recreational activities related to lakes and increasing urbanization near water bodies also contribute to the market's growth. While the market presents significant opportunities, challenges exist. High initial investment costs associated with specialized equipment and skilled personnel can hinder market penetration, particularly for smaller companies. Furthermore, weather conditions can significantly impact data acquisition, leading to project delays and cost overruns. However, ongoing technological advancements, coupled with increasing government funding for water resource management initiatives, are mitigating these restraints. The market is segmented by technology (LiDAR, sonar, multibeam), application (environmental monitoring, dredging, construction), and region, with North America and Europe currently dominating the market share due to higher environmental awareness and technological advancements. Based on an assumed CAGR of 8% and a 2025 market size of $300 million (a reasonable estimate considering the listed companies and their scope of operations), we project substantial growth over the forecast period, with increasing adoption across various geographic regions.

Global Lake Mapping and Bathymetry market size 2025 was XX Million. Lake Mapping and Bathymetry Industry compound annual growth rate (CAGR) will be XX% from 2025 till 2033.

Depth maps for selected lakes. Map types: Symbols, Choropleths, Raster image. Spatial extent: Switzerland. Time: 2023

Bathymetry is the measurement of water depth in lakes. From the 1940s to the 1990s, the Ministry of Natural Resources and Forestry produced bathymetry maps for over 11,000 lakes across Ontario. The data can be used by the general public and GIS specialists for: * climate change modelling * fish monitoring and other ecological applications * hydrologic cycle modelling * recreational fishing maps * watershed-based water budgeting The maps were created using simple methods to determine lake depths. They were meant for resource management purposes only. Little effort was made to identify shoals and other hazards when creating these bathymetric maps. Since this data was collected, many constructed and naturally occurring events could mean that the depth information is now inaccurate, so these maps should not be used for navigational purposes. In many cases, these maps still represent the only authoritative source of bathymetry data for lakes in Ontario. Technical information These maps are being converted to digital GIS line data which can be found in the Bathymetry Line data class. The Bathymetry Index data class identifies if GIS vector lines have been created and the location of mapped lakes. The historic paper maps have been scanned into digital files. We will add new digital files to this dataset if they become available. The digital files have been grouped and packaged by regions into 13 compressed (zipped) files for download. Note: package 99 contains scanned maps where the location shown on the map could not be determined.

The files linked to this reference are the geospatial data created as part of the completion of the baseline vegetation inventory project for the NPS park unit. Current format is ArcGIS file geodatabase but older formats may exist as shapefiles. Our final map product is a geographic information system (GIS) database of vegetation structure and composition across the Crater Lake National Park terrestrial landscape, including wetlands. The database includes photos we took at all relevé, validation, and accuracy assessment plots, as well as the plots that were done in the previous wetlands inventory. We conducted an accuracy assessment of the map by evaluating 698 stratified random accuracy assessment plots throughout the project area. We intersected these field data with the vegetation map, resulting in an overall thematic accuracy of 86.2 %. The accuracy of the Cliff, Scree & Rock Vegetation map unit was difficult to assess, as only 9% of this vegetation type was available for sampling due to lack of access. In addition, fires that occurred during the 2017 accuracy assessment field season affected our sample design and may have had a small influence on the accuracy. Our geodatabase contains the locations where particular associations are found at 600 relevé plots, 698 accuracy assessment plots, and 803 validation plots.

These data provide an accurate high-resolution shoreline compiled from imagery of SOUTH SHORE OF PRIEN LAKE, LA . This vector shoreline data is based on an office interpretation of imagery that may be suitable as a geographic information system (GIS) data layer. This metadata describes information for both the line and point shapefiles. The NGS attribution scheme 'Coastal Cartographic Object...

Lake cover strongly affects the reflectance of the land surface over large areas of Alaska, and was useful for identifying extensive wetlands. Lake cover was based on the number of AVHRR water pixels in each mapped polygon, divided by the number of pixels in the polygon. Since the imagery has a pixel size of 1 km^2, lake cover is underestimated for areas with many small lakes. Pixels within 2 km of the coastline were excluded to avoid ocean water. The percent cover data were grouped into six categories: 25%. Back to Alaska Arctic Tundra Vegetation Map (Raynolds et al. 2006) Go to Website Link :: Toolik Arctic Geobotanical Atlas below for details on legend units, photos of map units and plant species, glossary, bibliography and links to ground data. Map Themes AVHRR NDVI , Bioclimate Subzone, Elevation, False Color-Infrared CIR, Floristic Province, Lake Cover, Landscape, Substrate Chemistry, Vegetation References Raynolds, M.K., Walker, D.A., Maier, H.A. 2005. Plant community-level mapping of arctic Alaska based on the Circumpolar Arctic Vegetation Map. Phytocoenologia. 35(4):821-848. http://doi.org/10.1127/0340-269X/2005/0035-0821 Raynolds, M.K., Walker, D.A., Maier, H.A. 2006. Alaska Arctic Tundra Vegetation Map. 1:4,000,000. U.S. Fish and Wildlife Service. Anchorage, AK.