topic Re: Will UNION solve the following question? in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/will-union-solve-the-following-question/m-p/683210#M22690 <HTML><HEAD></HEAD><BODY><P><A class="link-titled" href="https://pro.arcgis.com/en/pro-app/tool-reference/analysis/union.htm" title="https://pro.arcgis.com/en/pro-app/tool-reference/analysis/union.htm">Union—Help | ArcGIS Desktop</A>&nbsp;</P><P>retains the attributes of both files.&nbsp; You then have to query for those features that contain both conditions in the table.</P><P>A subset query for those meeting the first condition on the shape_area field will give you the undeveloped parcel on the flood plain that are greater than your specified area.</P><P>Of course... shape_area will be in the units of your data set, which should be in a projected coordinate system.&nbsp; If they are decimal degrees, then you have a few hoops to go through to but</P><P><A class="link-titled" href="https://pro.arcgis.com/en/pro-app/tool-reference/data-management/calculate-geometry-attributes.htm" title="https://pro.arcgis.com/en/pro-app/tool-reference/data-management/calculate-geometry-attributes.htm">Calculate Geometry Attributes—Data Management toolbox | ArcGIS Desktop</A>&nbsp;</P><P>has an option to calculate the geometry of your features in acres</P></BODY></HTML> Thu, 21 Feb 2019 17:34:23 GMT DanPatterson_Retired 2019-02-21T17:34:23Z Will UNION solve the following question? https://community.esri.com/t5/geoprocessing-questions/will-union-solve-the-following-question/m-p/683209#M22689 <HTML><HEAD></HEAD><BODY><P>Will the UNION function get at the following problem?</P><P></P><P>I have a polygon layer that consists of areas in&nbsp; a floodplain that are also in an "undeveloped" land use category.&nbsp;</P><P>Now I am also using the information from a land ownership parcels (PARCELS) file, and I want to know which of these undeveloped floodplain polygons are in land parcels that are greater than 40 acres (or any other size).</P><P></P><P>Will a simple UNION function allow me to get this?&nbsp;</P></BODY></HTML> Thu, 21 Feb 2019 17:20:12 GMT https://community.esri.com/t5/geoprocessing-questions/will-union-solve-the-following-question/m-p/683209#M22689 JerryGriffith1 2019-02-21T17:20:12Z Re: Will UNION solve the following question? https://community.esri.com/t5/geoprocessing-questions/will-union-solve-the-following-question/m-p/683210#M22690 <HTML><HEAD></HEAD><BODY><P><A class="link-titled" href="https://pro.arcgis.com/en/pro-app/tool-reference/analysis/union.htm" title="https://pro.arcgis.com/en/pro-app/tool-reference/analysis/union.htm">Union—Help | ArcGIS Desktop</A>&nbsp;</P><P>retains the attributes of both files.&nbsp; You then have to query for those features that contain both conditions in the table.</P><P>A subset query for those meeting the first condition on the shape_area field will give you the undeveloped parcel on the flood plain that are greater than your specified area.</P><P>Of course... shape_area will be in the units of your data set, which should be in a projected coordinate system.&nbsp; If they are decimal degrees, then you have a few hoops to go through to but</P><P><A class="link-titled" href="https://pro.arcgis.com/en/pro-app/tool-reference/data-management/calculate-geometry-attributes.htm" title="https://pro.arcgis.com/en/pro-app/tool-reference/data-management/calculate-geometry-attributes.htm">Calculate Geometry Attributes—Data Management toolbox | ArcGIS Desktop</A>&nbsp;</P><P>has an option to calculate the geometry of your features in acres</P></BODY></HTML> Thu, 21 Feb 2019 17:34:23 GMT https://community.esri.com/t5/geoprocessing-questions/will-union-solve-the-following-question/m-p/683210#M22690 DanPatterson_Retired 2019-02-21T17:34:23Z