GPS Accuracy: HDOP, PDOP, GDOP & Multipath
Have you ever wondered about your GPS accuracy? A well-designed GPS receiver can achieve a horizontal accuracy of 3 meters or better. But factors affect it.
Remote Sensing
Geosynchronous vs Geostationary Orbits
While geosynchronous satellites can have any inclination, the key difference is that satellites in geostationary orbit lie on the same plane as the equator.
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.
Light Reflection, Absorption and Transmission in Remote Sensing
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.
Supervised and Unsupervised Classification in Remote Sensing
Supervised classification creates training areas, signature file and classifies. Unsupervised classification generate clusters and assigns classes.
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 Selective Availability in GPS?
When selective availability was enabled, this added 50 meters of error horizontally and 100 meters vertically to GPS signals.
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.
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.