Digital Geography

Remote Sensing at AGU (part II- vegetation time series)

In a previous post I talked about some of the remote sensing themes during the first half of the American Geophysical Union Fall meeting. Here I want to talk about the latter part of the week at AGU and the headline remote sensing topic: vegetation time series. In the early 1970s Compton J. Tucker investigated the spectral reflectance of prarie grass, leading to a host of publications in the mid to late 1970s on spectral reflectance of vegetation, the use of multispectral satellite imagery for vegetation monitoring and, ultimately, the Normalized Difference Vegetation Index (NDVI). At AGU we saw that NDVI…

Remote Sensing at AGU (Part1))

The Fall Meeting of the American Geophysical Union is one of the largest annual gatherings of scientists. Some 22000 have descended on San Francisco to discuss topics from the magnetosphere and heliosphere to river erosion mapping using airborne laser scanning and the use of GRACE for water budget estimation in the Colorado River basin. Here some of my highlights from the first half of the meeting: Google is coming (cheer or run for cover as appropriate). Google have laid out their new Earth Engine, an online, in the cloud, satellite image processing system. Yup, they really are taking over the…