https://community.esri.com/t5/arcgis-spatial-analyst-questions/search-for-raster-cells-representing-only-specific/m-p/1328562#M11987 <P>- Using Pro 3.1.1</P><P>I need to locate specific infrastructure on a 3m resolution DEM. The specific infrastructure are dams throughout a county. Naturally, I went through the usual hydrology tools to narrow down search area to the stream network within the county, and I began by using the masked Extract by Attributes on a Drop Raster because it seemed like the best choice. The search did locate most of the dams (I have a validation data set), but it also located thousands of other false positives. What other tools or code is available to further refine the search to only locate the dams?</P><P>Perhaps a better question would be how can I include more search criteria in the process? For example "locate only cells that are grouped adjacent to each other with high threshold values" and/or "locate only cells that are within a short distance (say 3 meters) from a large water body" (which could be the expected reservoir upstream of the dam).&nbsp;</P><P>&nbsp;I am a novice with Python (teaching myself in spare time), but was also exploring the Raster Cell Iterator as a potential. Good idea/bad idea?&nbsp;</P> Thu, 14 Sep 2023 04:06:52 GMT DanOcean 2023-09-14T04:06:52Z https://community.esri.com/t5/arcgis-spatial-analyst-questions/search-for-raster-cells-representing-only-specific/m-p/1328562#M11987 <P>- Using Pro 3.1.1</P><P>I need to locate specific infrastructure on a 3m resolution DEM. The specific infrastructure are dams throughout a county. Naturally, I went through the usual hydrology tools to narrow down search area to the stream network within the county, and I began by using the masked Extract by Attributes on a Drop Raster because it seemed like the best choice. The search did locate most of the dams (I have a validation data set), but it also located thousands of other false positives. What other tools or code is available to further refine the search to only locate the dams?</P><P>Perhaps a better question would be how can I include more search criteria in the process? For example "locate only cells that are grouped adjacent to each other with high threshold values" and/or "locate only cells that are within a short distance (say 3 meters) from a large water body" (which could be the expected reservoir upstream of the dam).&nbsp;</P><P>&nbsp;I am a novice with Python (teaching myself in spare time), but was also exploring the Raster Cell Iterator as a potential. Good idea/bad idea?&nbsp;</P> Thu, 14 Sep 2023 04:06:52 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/search-for-raster-cells-representing-only-specific/m-p/1328562#M11987 DanOcean 2023-09-14T04:06:52Z https://community.esri.com/t5/arcgis-spatial-analyst-questions/search-for-raster-cells-representing-only-specific/m-p/1328593#M11988 <P>If you have a value threshold in mind .... &gt; , &gt;=</P><P><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/an-overview-of-the-math-logical-tools.htm" target="_blank">An overview of the Logical Math toolset—ArcGIS Pro | Documentation</A></P><P>"buffering" for within a distance of, can be done using a variety of means, like</P><P><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/euclidean-distance.htm" target="_blank">Euclidean Distance (Spatial Analyst)—ArcGIS Pro | Documentation</A></P><P>These are just some samples of what can be done using the spatial analyst tools</P><P>condition checking like Con can be used to query conditions like your distance question from water</P><P><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/an-overview-of-the-conditional-tools.htm" target="_blank">An overview of the Conditional toolset—ArcGIS Pro | Documentation</A></P> Thu, 14 Sep 2023 08:07:45 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/search-for-raster-cells-representing-only-specific/m-p/1328593#M11988 DanPatterson 2023-09-14T08:07:45Z