Chart and table of population level and growth rate for the Tucson metro area from 1950 to 2025.

Annual (1986-2020) land-use/land cover maps at 30-meter resolution of the Tucson metropolitan area, Arizona and the greater Santa Cruz Watershed including Nogales, Sonora, Mexico. Maps were created using a combination of Landsat imagery, derived transformation and indices, texture analysis and other ancillary data fed to a Random Forest classifier in Google Earth Engine. The maps contain 13 classes based on the National Land Cover Classification scheme and modified to reflect local land cover types. Data are presented as a stacked, multi-band raster with one "band" for each year (Band 1 = 1986, Band 2 = 1987 and so on). Note that the year 2012 was left out of our time series because of lack of quality Landsat data. A color file (.clr) is included that can be imported to match the color of the National Land Cover Classification scheme. This data release also contains two JavaScript files with the Google Earth Engine code developed for pre-processing Landsat imagery and for image classification, and a zip folder "Accuracy Data" with five excel files: 1) Accuracy Statistics describing overall accuracy for each LULC year, 2) Confusion Matrices for each LULC year, 3) Land Cover Evolution - changes in pixel count for each class per year, 4) LULC Change Matrix - to and from class changes over the period, and 5) Variable Importance - results of the Random Forest Classification.

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Plan submitted by: Barbtell on 11/1/2021 USER DESCRIPTION: This version respects two separate communities of interest while satisfying all criteria. I also increases compactness. USER PLAN OBJECTIVE: Objectives were to preserve the Tucson Estates/ Avra Valley Communities of Interest and also preserve the Tucson Mountains Community of Interest. LD10.0 badly divided the East side of the Tucson Mountains Community from the Tucson Metro Area, placing locations just a few miles from downtown in D16 which includes much of Pinal County. This version replaces Starr Pass Resort and precincts from Grant/Ironwood HIll in a district near downtown that extends from Sentinal Peak to Camino del Cerro. This map modifies LD0028 to include the Tucson Mountains/downtown link.

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Four geomorphically distinct ages of alluvial fan surfaces can be recognized on the piedmonts flanking the Catalina, Tortolita, and Tucson Mountains. Channel entrenchment of the upper piedmonts during the Quaternary has lead to the preservation of individual fan surfaces that become progressively younger and lower in relief toward the valley axes. Ongoing downcutting of Rillito Creek and Santa Cruz River as well as the Canada del Oro Wash has enhanced the incision of mountain-sourced drainages and further increased the relief separating alluvial surfaces of different ages. Thus, periods of climatically induced downcutting separated times of aggradation or equilibrium produce a sequence of discrete alluvial surfaces of different ages. Episodes of downcutting along the Santa Cruz and Rillito Rivers has further resulted in a series of fluvial terraces within the central Tucson Basin Area. Wide pediments flanking each of the mountain fronts in the map area indicate general tectonic quiescence during the Quaternary.( 7 pages & 12 map sheets, 1:24,000 scale)

The study area is located ~50 km north of downtown Tucson, and is bounded by the Tortolita Mountains on the south, the Suizo Mountains on the west, and Black Mountain on the northeast. The map area covers the Chief Butte 7 ' Quadrangle. The area was mapped during October 2001 through April 2002 as part of a multiyear mapping program directed at producing complete geologic map coverage for the Phoenix-Tucson metropolitan corridor. A 1:24,000 scale map is the primary product of this study.This map builds on and complements previous and concurrent surficial geologic mapping efforts in the Tucson area. Supplemental_Information: The mapping was done under the joint State-Federal STATEMAP program, as specified in the National Geologic Mapping Act of 1992, and was jointly funded by the Arizona Geologic Survey and the U.S. Geological Survey under STATEMAP Program Contract #01HQAG0098. The view and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.