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Hi, how can I generate stream network from flow accumulation whihc is based on d4 flow direction. I want to avoid diagonal connections in rivers. Thanks
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03-09-2012
04:16 AM
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0
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1
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536
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POST
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Hi, I posted this in spatial analyst, but I think it fits here better. when I create stream network, I always get too many segments for the one stream (river). How can I get one segment (one polyline for example) for one stream or one complete river. I am using ArcGIS 9.3. Thanks
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06-28-2011
05:49 AM
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0
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0
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489
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POST
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Hi, when I create stream network, I always get too many segments for the one stream (river). How can I get one segment (one polyline for example) for one stream or one complete river. Thanks
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06-28-2011
05:47 AM
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0
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0
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199
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Hi, When I generate the river network from the dem raster in ArcGIS, the river network is very disconnected. I means that there are many location where there are small segments which are not connected. How can ensure connectivity? Thanks
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06-24-2011
01:19 AM
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0
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0
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449
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Dear all, I have a dem raster for a certain area, and I need to have the compound topographic index of the same area. Can anyone help me and write the steps (really the steps in details) how can I go from dem to this index. thanks Taiseer
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06-17-2011
04:44 AM
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0
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3
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5685
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Thanks, actually the problem is more complicated than shifting a raster. I am working with data sets from a climatological software (called COSMO) and imported these netcdf files into the ArcGIS. Now these files are based on a rotated coordination system, and not on a the real geographical system. When I plot the country of interest - which should be in the middle of the domain I get its data as netcdf files from COSMO - the country is away from the domain. This is logic, because the country has the real geographical coordination system. I wanted to shift the country to be in its (rotated) coordination system and to match the netcdf-based domain. This is correct but very inaccurate. Why? because all the x&y coordinates of the country should be transformed into the rotated coordination system. There is a FORTRAN script I wrote to transform these points. But the question now is: *** How to get the whole x and y coordinate of a certain polygon, a country? Thanks
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02-17-2011
02:09 AM
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0
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0
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744
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Hi, I have a raster (a rectangle). I want to shift it through giving the four corners new coordinates. Could anyone help, Thanks
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02-15-2011
03:36 AM
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0
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2
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2778
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Dear All, How can I be able to generate the slope of a raster file (dem). I need here two types of slopes: the slope in the x-direction, and the slope in the y-direction of the same dem raster file. Thanks
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01-14-2011
12:07 AM
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0
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2
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1047
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Dear all, I am going to apply the TOPMODEL for the runoff. There are many steps to do that and here are some concrete questions. But please know that I am using the ArcGIS 9.3. The given data I have is only a raster for the DEM. 1. There is something called CTI (Compound Topography Index) or it is known as the Steady state wetness index. How to generate it for a given watershed. 2. There is something called the Upstream Contribution Area, how to generate it as well. Thanks Taiseer
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12-16-2010
07:08 AM
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0
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0
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2331
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Hello helpers, I have a dem-raster, and I have no problem in converting it into ASCII file. However, the result ASCII has 583 columns and 472 raws which is not suitable my specific further applications. The resulted ASCII file should have 640 columns and 512 rows. How can I extract (by mask or any other way) a sub domain of the original dem-raster with known columns and rows numbers. Thanks
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09-06-2010
06:11 AM
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0
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2
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672
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POST
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Dear Helpers, I have some datasets for a part of Northeastern China. These datasets are Features (Points, Lines and Polygons shape-files) and Raster (mainly DEM grids). These datasets, however, have either no coordination system or different geographical coordination system. Before going in any further application I have to unify one Projected Coodination System for these different datasets. What is the suitable Projected Coordination System (or Systems) to be used for datasets in China? I tried it using the UTM: WGS_1984_UTM_Zone_8N, it does not work and I get this error message: A locator with this name does not exist Failed to execute (Project). Could you help? Thanks Taiseer
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09-02-2010
01:31 AM
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0
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1
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2136
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Dear Helpers, I have some datasets for a part of Northeastern China. These datasets are Features (Points, Lines and Polygons shape-files) and Raster (mainly DEM grids). These datasets, however, have either no coordination system or different geographical coordination system. Before going in any further application I have to unify one Projected Coodination System for these different datasets. What is the suitable Projected Coordination System (or Systems) to be used for datasets in China? I tried it using the UTM: WGS_1984_UTM_Zone_8N, it does not work and I get this error message: A locator with this name does not exist Failed to execute (Project). Could you help? Thanks
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09-02-2010
01:30 AM
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0
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1
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614
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POST
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Hi, To delineate watersheds there are some few steps, one of them deals with pour points. What is this and how can I do it? Thanks
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09-01-2010
11:33 PM
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0
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0
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2283
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Hello, I have a raster grid for the digital elevation model for a certain part in China. When I view the rasters' properties, it shows that the units in Degrees. On the ArcGIS, the units also are in Degrees. I can also see the following information: - Spatial Reference: GCS_WGS_1984 - Linear Unit: - Angular Unit: Degree (0.01745329251) - Datum: D_WGS_1984 The questions are: 1- How can I convert this coordination system, 2- What is the coordination system that I should use, 3- My objective is to have the Units in meters or Kilometers, because I need the ASCII file of the dem for further applications. Thanks
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09-01-2010
08:47 AM
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0
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1
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499
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