The process of sorting or arranging entities into groups or categories; on a map, the process of representing members of a group by the same symbol, usually defined in a legend.
6
votes
1answer
235 views
How to perform unsupervised classification of LANDSAT time series using Grass?
I'm using GRASS to perform an unsupervised classification on a time series of LANDSAT images (monthly temporal res, over 30 years), in order to compare land cover change in a particular area.
I'm ...
2
votes
0answers
40 views
Best source for high-resolution satellite images free/low-cost?
I am doing a household survey in Kenya, and I need to ensure that my survey team visits every house within a given area. I've been going to google maps and right-clicking on roofs to get coordinates ...
2
votes
0answers
129 views
ISODATA unsupervised classification in ArcMap 10.1
I’m doing a project on landsat 5 images.
I’ve composited the images into 1 raster, and I want to classify the raster with ISODATA Unsupervised Classification.
How do I calculate the best number of ...
1
vote
0answers
61 views
Segmentation Violation in ArcView 3.1 while performing UpdateLegend
I am loading a ".avl" legend file into ArcView 3.1 and I am plagued with a recurring Segmentation Violation Error when I execute the updatelegend command in the theme.
It looks like the legend file ...
1
vote
0answers
67 views
From classified image to topology in ArcInfo
I have some coastal 4 band imagery that I have classified to designate land, water, and undetermined. I want to convert this to polygons with topology, and significantly simplify the polygons.
If I ...
0
votes
0answers
16 views
How to snap Vector Layer projection to Raster layer projection in QGIS?
I have raster in correct projection. I used ShapeFiles, and marked objects(manually), but i found out that my vector layers have different projection, so they have different size and position. Is ...
0
votes
0answers
22 views
how separate Mixed classes
I am trying to deal with the aggregate data in Africover, I want to separate for example the mixed class – In North Kurdufan if I want the 6R from 2H/6R what is the a correct equation I have to write ...
0
votes
0answers
36 views
How to perform Neural Network Classification?
I'm using ENVI 4.8.There are some problems on parameters for Neural Network in Envi.(Envi-Classification-Supervised-Neural net)
There are 5 bands and 12 classes that i have used for my study .
The ...
