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Introduction to Synthetic-aperture Radar (SAR) earth observation and remote sensing

Introduction to Synthetic-aperture Radar SAR

by Daniel ODonohue 18 min read


Instead of one long antenna that sends one big pulse at one time and then collects the pulses that come back, SAR have a much smaller antenna that sends lots of pulses in quick succession over time as the satellite goes through space.It “listens” to the pulses that come back to it when it moves through its orbit.That’s why the name synthetic is applied to the radar.

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Satellite-based Augmentation System, GPS base station in the sky

Satellite-based Augmentation System - A base station in the sky

by Daniel ODonohue 14 min read

SBAS stands for Satellite-Based Augmentation System to standard GPS or GNSS signals. It’s a service that improves the quality of positioning from GPS — from multiple meters down to sub-meter level.SBAS uses similar technologies to other high-precision correction services people might be familiar with. It leverages an entire network of continuously operating reference stations around the ground area.

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Raster Frames, spatial imagery in apache spark

Raster Frames - Making imagery a first class citizen of apache spark

by Daniel ODonohue 12 min read

Commercial satellite providers produce somewhere between 100 and 200 terabytes of imagery a day ̶ a monstrous amount of information. Sentinel 2 has five years of daily refresh data. We have 40+ years of Landsat data. It’s a massive amount, particularly in the temporal dimension, where you can do longitudinal studies. Apache Spark and Raster Frames might just be the tools we need to handle this much data.

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cloud detection

cloud detection

by Daniel ODonohue 9 min read

The biggest value you get from satellite images is that you can see what’s on the ground. If there is too much water vapor in front of the satellite imaging sensors, it obscures the Earth’s surface, and you might lose all value of the platform.
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Remote sensing data collection using Radio Frequency GIS geospatial remote sensing podcast for digital geographers

Radio Frequency Data Collection

by Daniel ODonohue 6 min read

Remote sensing with a difference. That’s what Ellen Christopherson, CEO and founder of clearGrid, is here to talk about.  Their unique way of collecting radio frequency (RF) data makes them a valuable partner for utility and energy companies that do any type of meter readings and billings. Ellen’s background in aviation engineering gives her an edge to see how technology can deliver efficiency in this space.
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GIS and Geospatial podcast, remote sensing and robotics

Robotics, remote sensing and facilities management

by Daniel ODonohue 9 min read

The Mars Rover Project.  Autonomous robots monitoring substations.  How is this all relevant to the geospatial community? Scott Nowicki is happy to clarify. He explains the technology that enables robots to integrate detailed maps, orientate, and move around their environments as they go on their daily business and build detailed change detection maps for substations and facilities management. But the question is, can they and do they truly add value to operations where human presence is difficult or unnecessary?
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Remote sensing and earth observation podcast

Remote sensing and future of earth observation

by Daniel ODonohue 1 min read

The future of remote sensing and earth observation might be open, collaborative and involve much more end user education that you expect. DR Aliastra Graham shares his observations based on 20 years of experience in the industry.
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