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Dear collegues, I am working with the path tracing tool delineating the streams until the top of the hills (extremly useful tool) but I have a problem as the results of such a tool are graphic lines and I would like to convert them into raster format or polyline.. Any idea? Thank you very much in advance, Guillem
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07-25-2012
05:26 AM
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Dear all, I am trying to get, separately, the two slopes belonging to a subbasin. I have done all the steps of the Terrain Processing tool (HECGeoHMS) in order to get the subbasions of an area. Then I have created an HMS Project. I have realised there are several tools which allow to work with subbasins and modify them, but I have been unable to separate the subbasions into their two slopes (each side of the river). I know I can superimpose drainage line with subbasins in order to get them on an automatically way, but problems comes when it is working in the first order subbasin, where the drainageline does not reach the top of such a subbasin. I would be very grateful if someone could help. Yours sincerely. Guillem
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04-03-2012
06:11 AM
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Dear Eric, Thank you very much for your help, I think it could be very useful, but I think Zonal histogram is only available with ArcGIS10 and I have the version 9.3.1. On the other hand, I also need to know the number of pixels for each cluster with the same color. For instance, in the image attached, I would need to know how many green pixels I have (this is easy), but the most difficult is to know how many yellow pixels I have in each yellow cluster. The most problematic thing is that if you have a polygon feature, ArcGIS, only identify groups of pixels with the same value, in such a case color, and those which share some side each other, but not some vertex. In my case, the group of yellow pixels bold with a blue line should belong to the other group of yellow pixels located bellow but it is not because the two groups only share a vertex of one pixel instead of the whole side. yours sincerely, Guillem
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05-05-2011
01:31 AM
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Dear colleagues, I have superimposed a raster map, with different pixels values, and a shapefile (polygons). I would like to know if it is possible to find out how many pixel values of each class I have in each polygon. I think I can accomplish it converting the raster map to a polygon map and applying an "intersect" but I would like to work directly with the raster map rather than convert it. For instance, in the image I attach bellow, I would like to know how many green, orange, yellow and red pixels i have inside each polygon (black lines). I would be really grateful if your could help me. yours sincerely, Guillem
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04-26-2011
03:31 AM
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Dear William Hubber, Maybe you are refering to focal statistics, because in this tool, if the majority value is repeated the program gives you "NoData" value. I hope they will change it again Thank you very much for your help Guillem
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03-11-2011
04:44 AM
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Dear colleagues, When you use the tool "Zonal statistics" (type majority), if there is a tie in a zone the output for all cell locations in the zone is assigned the lowest of the tied values. Someone knows if it is possible to assign the highest value instead of the lowest? Best regards, Guillem
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03-10-2011
04:56 AM
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Dear colleagues, I would like to know if I can calculate the majority value that surround a group of pixels. I need to calculate the majority value that surround this GROUP OF PIXELS THAT HAS THE SAME VALUE, NOT THE MAJORITY THAT SURROUND EACH PIXEL. I have been trying with focal statistics but i didn't succeed.. Then i need to change the value (or color) of this group of pixels for its majority value that surrounds it. In the picture below (Figure1) you can find and example of this case: There is a group of two yellow pixels market with a red circle. I need to convert this group of two yellow pixels into orange (the majority color that surround this group) Best wishes, Guillem
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02-18-2011
02:35 AM
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Dear collegues, I would like to know if it is possible to individualize a raster map by means of a polygon (feature). Like I show in the figure below, I have this raster map with diferent colours and I would like to separate according to the diferent polygons I have on it (black lines). My objective is to be able to work with each part of the raster individually. I have been thinking of vectorizing the raster map and then apply a "clip", "union" or intersect with the polygons but i would like to keep the raster format. Best wishes, Guillem
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01-25-2011
08:45 PM
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Dear William huber, Many thanks for your help. I have tried it and it works perfectly. It has solved perfectly my question. It is also very fast and you don't have to transform from raster to polygon, which sometimes is a bit problematic. Cheers, Guillem
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01-12-2011
07:19 AM
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Dear colleagues, I need to identify clusters of pixels with the same value and an area lower than a specific value. If some of these clusters are surrounded by a group of pixels that have the same value each other, I need to give to this clusters the same value than the pixels around them. The main problem is that I have a lot of clusters and I need to do it automatically. I attached an example (fig1). In this case, there are four clusters: Two of orange pixels and two of green pixels. In both cases they are surrounded by yellow pixels, hence, pixels of this four clusters should be convert into yellow color. If someone knew a methodology to do it I would be really grateful. Best wishes, Guillem
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01-11-2011
07:31 AM
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Dear colleagues, I need to identify clusters of pixels with the same value and an area lower than a specific value. If some of these clusters are surrounded by a group of pixels that have the same value each other, I need to give to this clusters the same value than the pixels around them. The main problem is that I have a lot of clusters and I need to do it automatically. I attached an example (fig1). In this case, there are four clusters: Two of orange pixels and two of green pixels. In both cases they are surrounded by yellow pixels, hence, pixels of this four clusters should be convert into yellow color. If someone knew a methodology to do it I would be really grateful. Best wishes, Guillem
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01-11-2011
07:13 AM
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