April, 2014

GIS Learning

Map making by the Women's Voluntary Service during World War II.

Sunday Maptinee: Map Films from British Pathé

British Pathé once provided entertaining news reels as part of the British movie going experience.  Over 85,000 news videos representing the entirety of its archives have been uploaded to YouTube.  The news reels span 1896 to 1976 and covers a range of news, sports, and entertainment. Included in this collection are […]

Spatial Analysis

Figure 1: End-member classification of a three-component system, with soil (yellow), water (blue) and vegetation (green) identified. Image credit: University of Maryland, http://glcf.umd.edu/data/coastal/mixture.shtml

ASTER and the Spectral Recipe for Finding Gold

In the last section of this series, we took a look at both the ASTER sensor and the vast library of spectral profiles built as a standard reference for multi-spectral analysis and material classification. In this article, we will take a look at land cover investigations through spectral unmixing, which is […]

GIS Data

First Images from GPM Microwave Imager: The image shows rain rates across a 550-mile (885 kilometer) wide swath of an extra-tropical cyclone observed off the coast of Japan on March 10, 2014. Red areas indicate heavy rainfall, while yellow and blue indicate less intense rainfall. In the northwest part of the storm in the upper left of the image, the blue areas indicate falling snow.

NASA’s Global Precipitation Measurement

Water is essential for life on the Earth, and the supply of this precious liquid is constantly being recycled through energy from the sun. This process is known as the hydrologic cycle, and through it water is continuously exchanged between the land, the atmosphere, and the oceans. Precipitation in its […]

GIS Software

How to Share ArcMap (.mxd) Files

ArcMap is a component of Esri’s suite of desktop GIS software programs.  Users of ArcGIS use ArcMap primarily to create, edit, analyze, and display geospatial information.  Saved ArcMap files have the .mxd extension.  This file format is only usable within ArcMap.  To share maps created within ArcMap, most cartographers will […]

GIS Data, Spatial Analysis

The map shows age-adjusted colorectal cancer incidence and mortality rates per 100,000 population for Illinois residents by county and the locations of Federally Qualified Health Centers (FQHC). The purposes of the map are to identify areas with increased colorectal cancer incidence and mortality rates, educate the public and stakeholders on the burden of colorectal cancer in Illinois, and assist with future collaborative efforts toward reducing the burden of colorectal cancer among Illinois residents.

Overview of Public Health and GIS

This article provides an overview of the use of GIS as in public health. It includes a short history of its development as a tool in the field, explains how GIS is used, different data sources and how the privacy of sensitive health information is maintained. Examples of current research using GIS within the public health field are also provided.

GIS Data

Acquired on 13 April 2014 at 23:57 GMT (14 April at 01:57 CEST) by Sentinel-1A, this image shows a transect over the northern part of the Antarctica Peninsula. It was acquired in the satellite’s ‘strip map’ mode with a swath width of 80 km and in dual polarisation. The colours indicate how the land, ice and water reflect the radar signal differently. Source: ESA.

First Satellite Images from Sentinel-1A

Launched on April 3 and reaching operational altitude on April 11, the first images captured by the European Space Agency’s (ESA) Sentinel-1A satellite have been made public. The first of five satellites planned for the Sentinel group, Sentintel-1A will be tasked with gathering all-weather, day and night radar images.  Imagery […]

GIS Software

Call for Translators: gvSIG

The developers of open source GIS software gvSIG have issued a call for translators. gvSIG is a freely downloadable GIS software package written in Java that is available for Linux, Macintosh, and Windows platforms.  gvSIG is available in a multitude of languages: Spanish, English UK, English USA, German, French, Italian, Portuguese, […]

Spatial Analysis

Predicting the post apocalyptic geography of zombies using fuzzy logic. Source: The Undead Liven Up the Classroom, Edward González-Tennant.

Overview of Fuzzy Logic Site Selection in GIS

Site selection is a type of GIS analysis that is used to determine the best site for something and fuzzy logic is one site selection method. It assigns membership values to locations that range from 0 to 1 and is commonly used to find ideal habitat for plants and animals. This article examines fuzzy logic and explains how and when to use it.