Tag Info

New answers tagged

1

If anyone else has problems with this the best solution I have found is: find the ratio between the measurements in the two projections, divide the desired measurement by the undesired measurement, then multiply the answer by the desired measurement. For example: The measurement ratio between QGIS EPSG 3857 and Google Earth was 200m:153.15m. I need points ...


2

If you have LiDAR points then I will assume that you are working with a LAS file. Andre Silva raised the useful point that a robust solution to this problem would not require previously classified data, and so I am providing this alternative solution. Since your off-terrain points are one-hundred or so metres above your ground surface (possibly birds if it ...


3

User and producer accuracies refer to the exact value. It is an abuse of language not to mention that the values commonly derived from the confusion matrix are "estimates of ...". So you should talk about "estimated user accuracy" if you derive it from sampling (in practice, the indices are always estimated, this is why some people "forget" to mention it). ...


3

Sounds like you need a ground DEM first. In SAGA, you can import the point cloud, turn it into a grid while extracting ground points, then fill in the gaps with interpolation. Then, do the same thing by gridding the maximum elevation points + fill in the gaps. This will produce the DSM (digital surface model). Create a mask by taking a subset (extract) of ...



Top 50 recent answers are included