Remote Sensing Archives - Page 3 of 4

Trilateration vs Triangulation – How GPS Receivers Work

Have you ever wondered how your GPS receiver works? They use a technique called trilateration, which measures distances, not angles as in triangulation.

Lossy Compression vs Lossless Compression

Lossless Compression vs Lossy Compression

Lossless compression (like JPEG) retains values and lowers file size. However, lossy compression (like LZ77) reduces file size by eliminating redundancy.

Energy Interaction in Remote Sensing – Light Reflection, Absorption and Transmission

The EM radiation that makes it to Earth is called incident light. From here, Earth’s features reflect, absorb and transmit different amounts of energy.

Spectral Signature Cheatsheet – Spectral Bands in Remote Sensing

Every object has its own unique composition. This is equivalent to it having its own spectral signature. Choose the spectral bands for ideal classification

Landsat File Naming Convention – Scene Identifiers

The Landsat file name structure gives you the what, where, when and how the data was captured. (ex. LXS PPPRRR YYYYDDD GSIVV)

Composite Bands: Black and White to Color Imagery

If you want to display rasters in true color, you will have to combine the red, green & blue bands. The ArcGIS Composite Bands tool creates RGB composites.

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.

What is Remote Sensing? The Definitive Guide

Remote sensing is the science of obtaining information without physically being there. The 3 most common methods of capture is airplane, satellite & drones.

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

Pleiades Satellite Products: © CNES 2011-15, Distribution Airbus DS. Courtesy of BlackBridge

Pleiades Satellite Constellation: Spot the Detail

The agile Pleiades satellite constellation is comprised of Pleiades 1A and 1B. They offer dynamic image acquisition at 50cm panchromatic & 2m multispectral.