* Corresponding author. Abstract – The semi-arid Sahel zone of Africa has suffered several periods of severe drought since about 1950. We have analyzed AVHRR Normalized Difference Vegetation Index (NDVI) over the Sahel for the period 1982-2002, and found extensive areas of increasing NDVI. To verify these changes we have analyzed Landsat TM and ETM+ scenes from 1984-1986 and 1999-2001 for areas...

a r t i c l e i n f o Post-fire snags provide important resources for cavity nesting communities as well as being subject to timber removal through salvage logging practices. Tools that can characterize their distributions along with other features important as wildlife habitat, such as woody shrub cover, would be useful for research and management purposes. Three dimensional lidar data and Lan...

A hybrid algorithm of the BP-ANN/GA (Back Propagation Artificial Neural Network and Genetic Algorithm) is developed to optimize the initial weights and make fast convergence of the BP-ANN. This algorithm is applied to data fusion of Landsat ETM+ and ERS-2 SAR for classification of the urban terrain surfaces. An example of the Shanghai Pudong area using both the Landsat ETM+ and ERS-2 SAR image ...

First posted June 14, 2022 For additional information, contact: Program Coordinator, National Land Imaging U.S. Geological Survey 12201 Sunrise Valley Drive Reston, VA 20192Contact Pubs Warehouse Scenic Arkansas certainly lives up to its nickname, “The Natural State.” The Ozark Plateau and Ouachita Mountains boast stunning views, vast resources, recreation. Hardwood pine forests cover one-half ...

First posted August 3, 2021 Revised February 17, 2023 For additional information, contact: Program Coordinator, National Land Imaging U.S. Geological Survey12201 Sunrise Valley Drive Reston, VA 20192Contact Pubs Warehouse The Green Mountain State of Vermont is known for its vast swaths deciduous forest, patches evergreen, and the Mountains that run through center.Valuable insight into forests l...

First posted March 30, 2021 Revised October 17, 2022 For additional information, contact: Program Coordinator, National Land Imaging U.S. Geological Survey12201 Sunrise Valley Drive Reston, VA 20192Contact Pubs Warehouse The State of Texas has the largest land area any in contiguous United States, and its sprawling landscapes show rich geographic diversity. Lone Star cactus flats high plains fa...

First posted July 20, 2022 For additional information, contact: Program Coordinator, National Land Imaging U.S. Geological Survey 12201 Sunrise Valley Drive Reston, VA 20192Contact Pubs Warehouse Alabama’s warm climate and rich soil bolster its agriculture timber industries, but they also offer ideal conditions for natural playgrounds, enjoyed by humans the wildlife that call open green spaces ...

First posted April 25, 2022 Revised January 24, 2023 For additional information, contact: Program Coordinator, National Land Imaging U.S. Geological Survey 12201 Sunrise Valley Drive Reston, VA 20192Contact Pubs Warehouse Washington is a State of untamed wonders, from its ruggedly beautiful coastline to the volcanic peaks Cascades. “The Evergreen State” also contrasts, home rainforests west Cas...

Sammendrag/Abstract: In this report, we describe a method for geometric correction of satellite images generalizing a method developed for NOAA AVHRR images. The method is based on modeling the imaging process, including satellite orbital modeling. We also present an approach for automatic detection of ground control points based on matching of a near-infrared band with watermasks. The methods ...

The applicability of a land surface temperature (LST)-evapotranspiration (ET) regression model to estimate ET fraction (ETrF) was tested in the temperate maritime climate of Central Ireland. In this study, the Mapping ET at high Resolution and with Internalized Calibration (METRIC) model was applied to calculate evapotranspiration from a mixed land cover area in Central Ireland. The ETrF values...