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Caitlin Dempsey

Caitlin Dempsey has been the editor of GIS Lounge (https://gislounge.com) since 2001. More about Caitlin Dempsey and GIS Lounge on the contact page. Caitlin Dempsey is also the editor of Geography Realm (geographyrealm.com).
Side by side maps showing a UTM file with zones and rows and a UTM grid file with just the zones.

Dissolve Features Based on Attribute in QGIS

March 19, 2023 by Caitlin Dempsey

This GIS tutorial provides a step-by-step guide on how to dissolve features in QGIS based on an attribute field.

Categories Maps and Cartography
A vegetation map of the northwest corner of Wyoming with mostly medium and light green.

United States Cropland Data

March 11, 2023 by Caitlin Dempsey

The Cropland Data Layer (CDL) is an annually updated GIS dataset developed by the USDA that maps out crops grown in the United States.

Categories Maps and Cartography
Half of the Earth shown in a map.

What is a Map Projection?

March 23, 2023March 1, 2023 by Caitlin Dempsey

Map projections are techniques used to transform the Earth’s three-dimensional surface onto a two-dimensional plane, inevitably introducing some distortion in area, shape, distance, direction, or scale.

Categories GIS Learning Tags azimuthal, conformal, equal-area projections, map projections
A shaded relief map of the contiguous United Stated with medium grey lines showing UTM zones.

Universal Transverse Mercator (UTM) Coordinate System

March 21, 2023February 19, 2023 by Caitlin Dempsey

UTM is a precise, grid-based coordinate system ideal for regional mapping and navigation, utilizing 60 zones to minimize distortion.

Categories Maps and Cartography
A globe of the world with quotation marks.

GIS Poems (According to AI)

December 3, 2022December 3, 2022 by Caitlin Dempsey

To have a little fun with artificial intelligence, I decided to see what poetic geospatial delights ChatGPT could come up with.

Categories Maps and Cartography
A gray map of Oklahoma with the point locations of cities buffered in different sized purple circles depending on the elevation.

Buffers in GIS

November 4, 2022November 4, 2022 by Caitlin Dempsey

A buffer in GIS is a reclassification based on distance.

Categories Spatial Analysis Tags buffering, buffers, spatial analysis
Map of major tectonic plates. Source: USGS.

Where to Find Tectonic Plate GIS Data

February 19, 2023November 3, 2022 by Caitlin Dempsey

There are a few sources of freely available tectonic plate data available in various GIS data formats.

Categories GIS Data Tags geology and GIS, plate boundaries, plate tectonics
A cropped view of a map with a north arrow in bold black with the letter "N" on top of it. A section of Texas and Louisiana can be seen at the top of the image.

Should You Put a North Arrow on a Map?

March 20, 2023October 24, 2022 by Caitlin Dempsey

Do all maps need a north arrow?

Categories Maps and Cartography Tags cartographic elements, cartographic philosophy, Cartography, map elements, map making, orientation, use of north arrows
Marina del Rey area on a county map of the state of California.

Understanding Map Scale

February 19, 2023October 12, 2022 by Caitlin Dempsey

Map scale refers to the ratio between the distance on a map and the corresponding distance on the Earth’s surface.

Categories GIS Data Tags bar scale, generalization, gis data, GIS Essentials, graphic scale, large scale maps, map scales, representative fraction, RF, scale, small scale maps, spatial accuracy, verbal scale

Types of GIS Data Explored: Vector and Raster

October 21, 2022October 11, 2022 by Caitlin Dempsey

This article discussions different types of GIS data in both vector and raster formats.

Categories GIS Data Tags geodatabase, gis data, gis terminology, line, NDVI classification, point, polygon, raster data, vector data

Open Source GIS and Freeware GIS Applications

December 7, 2022September 29, 2022 by Caitlin Dempsey

There are many open source GIS and web mapping applications to choose from.

Categories GIS Software Tags geospatial software, GIS freeware, gis software, GRASS, gvsig, open source gis, open source web mapping, OpenMap, osgeo, QGIS, Quantum GIS, TileMill
Map of GIS Job Listings in the US

Heat Maps in GIS

October 8, 2022September 20, 2022 by Caitlin Dempsey

Heat mapping, from a GIS perspective, is a method of showing the geographic clustering of a phenomenon.

Categories Spatial Analysis Tags Crime Mapping, density surface, gis, google fusion tables, heat map, hot-spot analysis, raster
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Recent Posts

  • Dissolve Features Based on Attribute in QGIS
  • GIS for Local Government: Public Safety
  • United States Cropland Data
  • GIS for Local Government With Maptitude: Planning and Zoning
  • What is a Map Projection?
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