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State Plane Coordinate System Map Projections

The State Plane Coordinate System (SPCS)

The State Plane Coordinate System divides the United States into 124 zones to locate any point with a high level of accuracy (one part in 10,000).

Tissot's indicatrix North American Lamert Conformal Conic

Map Distortion with Tissot’s Indicatrix

Map distortion is best understood looking at Tissot’s indicatrix. It contains circles and shows how map projections distort shape, size and distances.

How to Create Flow Maps and Link Movement with Direction Lines

Cartographers use lines to show the movement of phenomenon (people, ideas or money) in flow maps. To show the magnitude, they change the width of flow lines

Cartogram Maps: Data Visualization with Exaggeration

Cartogram maps distorts reality to convey information. It accomplishes this by resizing and exaggerating any variable using a polygons geometry.

How to Sketch a Voronoi Diagram with Thiessen Polygons

In a Voronoi Diagram, when you take a point in any given Thiessen polygon, it indicates that it’s closer to that generating point than to any other.

Choropleth Maps – A Guide to Data Classification

Equal intervals, quantile, natural breaks, pretty breaks- data classification methods generate different choropleth maps. We explain the types of maps here.

Azimuthal Projection: Orthographic, Stereographic and Gnomonic

The azimuthal projection plots the surface of Earth using a flat plane. For example, common azimuthal projections are gnomonic, stereographic & orthographic

Aspect Maps: How Do You Find Out the Aspect of a Slope?

In the mountains, the terrain slopes are in all directions – east, west, north and south-facing. The compass direction that the slope faces is slope aspect.

Universal Transverse Mercator - UTM Zones (False Northing, False Easting)

How Universal Transverse Mercator (UTM) Works

Universal Transverse Mercator (UTM) segments the Earth into 60 zones (each UTM zone is 6‎°) and projects each zone with an upright cylinder of its own.

Define Your Key Features Symbology with a Map Legend

A map legend is used to define features in a map. Point, line and polygon symbols in a legend key is the driving-force to understand what is found in a map.

Software

The Hidden Powers of QGIS 3: 33 Truly Underappreciated Features and Plugins

When QGIS releases a new version, it’s kinda a big deal. Because the unsung heroes of open source GIS software are back! It’s their third big release. QGIS 3!
Remote Sensing

The Big Satellite List. 50 Satellites. 30 Words or Less.

Think you know remote sensing satellites? Think again. This satellite list has the top 50 satellites that silently orbit the Earth. In 30 words or less.
GIS Career

1000 GIS Applications & Uses – How GIS Is Changing the World

From over 50 industries, here are 1000 GIS applications to open your mind of our amazing planet, its interconnectivity with location intelligence in mind.

Software

27 Differences Between ArcGIS and QGIS – The Most Epic GIS Software Battle in GIS History

It’s a head-to-head GIS software showdown with the star-studded lineup in the GIS industry- ArcGIS vs QGIS. Discover the differences between ArcGIS and QGIS
Maps & Cartography

Magnetic North vs Geographic (True) North Pole

The Magnetic North Pole is a point in Northern Canada where the northern lines of attraction enter the Earth. Compass needles point to the magnetic north.
Software

13 Free GIS Software Options: Map the World in Open Source

There’s a bucket load of free GIS software packages available for you to map the world. Manage, visualize and edit GIS data with open source GIS software.

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