Latest Contributions by tt1

I have a WorldView-2 satellite raster which I re-projected from WGS84 to WGS84/UTM using Raster Project. I wish to export this from outside the geodatabase so I can share it with colleagues. However, when exporting the re-projected raster to my desktop (via right-clicking on it from the contents pane -> export), the exported raster has a changed pixel value range and white stripes appear where there was previously no data. I used the default settings when exporting. The white background stripes are caused by areas beyond the original raster extent (i.e., areas of no-data in the original raster) being assigned high-pixel values (65535) when exported. To resolve this, I've tried to set the "NoData Value" to zero. This removes the white background stripes. However, it also causes the exported raster's pixel range to begin from 1 rather than 0. Summary: My original raster pixel value range is 0 - 1504. When exported using default settings, a white background appears beyond the raster extents and the pixel value range is 0 - 65535. To resolve this, I've exported the raster with setting the Nodata value to 0. This removes the white background, however, it also causes the pixel range to go from 1-1504.  How can I export my raster image without creating pixels beyond the original extents or changing the pixel value range? ... View more

I have a high-resolution World View 2 satellite image with a cell size of 0.5 m. However the image is in a WGS84 coordinate system, so to get meter distance values instead of degrees I have converted it to a WGS84 / UTM projection. The raster in WGS84 / UTM projection has a cell size of 0.35. How can I convert the image into a WGS84 / UTM projection and maintain the 0.5 m cell size? I am using ArcGIS Pro and converted the coordinate system from WGS84 to WGS84 / UTM using "raster project" tool. ... View more

I am currently cleaning up a land classification map by removing slivers. However, I am struggling to manually delete very small sliver-like features as they're connected to a larger polygon which I wish to retain. Details I am encountering two types of slivers. 1) Enclosed Slivers, which are their own polygon feature and are surrounded by a larger polygon of a different class. 2) Open Slivers, which are actually connected to a large polygon. To remove Enclosed Slivers, I select the sliver polygon and delete it to create a gap, fill the gap using auto-complete new polygon tool and then merge it with the surrounding polygon. To remove an Open Sliver, I use the split tool to create two separate polygons and then repeat the process for Enclosed Sliver (delete sliver polygon to create gap, fill gap using auto-complete new polygon, merge). However, I have just come across an Open Sliver which is so fine and small that it is not possible to zoom in close enough to split its connection with the larger polygon. See image below Summary In the image below, there is a sliver (circled in red) which is actually connected to the large yellow polygon. It is not possible to zoom in close enough to use the "split" tool to split the sliver into its own feature (and therefore delete without removing the large yellow polygon). What can I do to eliminate this type of sliver error? I am using ArcGIS Pro. ... View more

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I have a land map with three labels (sand, vegetation and water).  I wish to eliminate overlaps and gaps between these labels. There are tens of thousands of gaps and overlaps, so I need to automate this process. I know how to do this for overlaps using ArcGIS tool but not for gaps. For overlaps, I detect the intersect between the 3 layers (sand, vegetation and water) using the intersect tool and then re-label the intersect using a simple calculation (the intersect is relabelled to whichever layer has the highest value for that space). For gaps, I'm struggling to find out eliminate the slivers via an automated approach. I've tried to create a topology to identify gaps and then use the eliminate tool to remove these slivers. Although the topology identifies gaps, I can't run the eliminate tool to remove the gaps as it requires "a selection". I don't know how to select gaps as this data is non-existent.    Data details:  A featureclass with 3 polygon types (sand, vegetation and water). ... View more

I have featureclasses with overlapping polygons which I can see visually in ArcGIS. I've created topology with the rule sand "does not overlap with" water. However, the resulting polygon errors output feature is empty. The only output with data is "dirty area".  What is causing this?  I've used the following options:  Define. XY Ranks: 1 Define. Feature Classes: sand, water.  Add Rules.  Feature Class 1: sand. Subtype 1: NA. Rule: does not overlap with. Feature Class 2: water. Subtype 2: NA.   ... View more