Katrina McLean
Earth Scientist and GIS Specialist
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Trip To Redlands

Katrina McLean / Blog / 0 comments

May 20, 2015

    Redlands California Blue Mountain Hike I recently went to Redlands California for a few days to interview with Esri and explore the area. I borrowed a bike from their bike share program (started last week!) and cycled to Blue Mountain Trail in Grand Terrace from the Country Inn and Suites in Redlands. I […]

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Common LiDAR Survey Errors

Katrina McLean / Blog, LiDAR, Microstation / 0 comments

February 11, 2015

Causes of Errors include positional erros with the GPS/IMU, range, scan angle, boresight angles, lever-arm offsets. These are systematic errors and corrections can be applied over the entire dataset. Range Errors – Not corrected for, occur due to recording of the time between emission and return of laser – centimeter scale. Beam Divergence – Common […]

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RADAR – Geometric Distortions

Katrina McLean / Blog, Remote Sensing / 1 comment

February 2, 2015

Geometric distortions of radar include foreshortening, layover and shadowing. Foreshortening and layover distortions are related to terrain. These errors are unlikely to occur in flat terrain. In rugged terrain higher elevation is detected by the sensor first which makes it seem closer than it actually is. Any terrain feature with a slope inclined toward the […]

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RADAR – Active Microwave

Katrina McLean / Blog, Remote Sensing / 0 comments

February 2, 2015

RADAR Sensors have a transmitter which send a pulse of electromagnetic radiation through the antenna at a specific wavelength and duration. These are off-nadir imaging sensors meaning that the have a look direction and angle which is controllable. The microwaves transmitted by the RADAR Sensors are much longer than visible, infrared or thermal infrared energy […]

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Active vs Passive Sensors

Katrina McLean / Blog, Remote Sensing / 0 comments

February 2, 2015

This is sort of where it all begins. Remote sensing systems can be classified into 2 types : Active and Passive. Passive sensors collect information without emitting any kind of signal. What this means is that it uses the electromagnetic energy that the sun emits and records the reflectance off of the earth. This includes […]

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What is LiDAR?

Katrina McLean / Blog, Remote Sensing / 1 comment

January 27, 2015

LiDAR is a method of remote sensing that uses laser pulses to gather information about the surface of the earth. Each laser has multiple returns to the sensor which are displayed as a cloud of points. LiDAR data is often collected from a fixed wing plane or helicopter. The height the survey is flown at […]

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Landsat Imagery Viewer

Katrina McLean / Blog, GIS, Remote Sensing / 0 comments

January 26, 2015

Libra is a web interface that lets you scroll through landsat imagery based on year and cloud cover. Take a look! http://libra.developmentseed.org/

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