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# Articles

## GIS Online Certificate: Charting a Course in GIS

Imagine you can earn a GIS online certificate at some of the best institutes in the world without leaving your country… or even the comfort of your own home.

## Degrees/Minutes/Seconds (DMS) vs Decimal Degrees (DD)

We can find any location on Earth using latitude and longitude coordinates. And we measure those coordinates with decimal degrees or degrees/minutes/seconds

## Capitalizing First Letters with Python in ArcGIS

If your letters and words are all uppercase or lowercase in a field, and you want to capitalize the first letter of each word, use this Python code block.

## What Is Selective Availability in GPS?

When selective availability was enabled, this added 50 meters of error horizontally and 100 meters vertically to GPS signals.

## Greenwich Meridian (Prime Meridian)

The Greenwich Meridian (or Prime Meridian) is a zero degrees longitudinal It is the start-point which we measure 180 degrees east and west.

## GIS Dictionary – Geospatial Definition Glossary

From A to Z, we deliver stunning visualizations and meanings with the GIS Dictionary – Definition Glossary. Sharpen your skills with new GIS terminology.

## What is Atmospheric Correction in Remote Sensing?

Dark object subtraction, radiative transfer models and atmospheric modelling are common techniques used to for atmosphere correction in remote sensing.

## Halloween Maps for the Dead

5 Halloween Maps. Almost all cultures recognize spirits aka the dead. So we bring these 5 maps for the dead to get you in the spirit of Halloween.

## How Map Projections Work

The best way to represent the Earth is with a globe. But map projections can be awfully useful too. Find out why cartographers use map projections in GIS.

## What is Bit Depth for Satellite Data (and Images)

Bit depth is the amount of detail in each pixel expressed in units of bits. 1-bit rasters contain 2 values while 8-bit rasters range from 0-255