https://community.esri.com/t5/arcgis-image-server-questions/determine-zoom-level-for-an-arbitrary-scale/m-p/1294481#M1674 <P>I am trying to obtain the acquisition date for an image form the standard imagery basemap from ArcGis Online. This image service consists of multiple 'sub-layers' for different zoom levels, and these 'sub-layers' may have been acquired at different times. For example levels 14-17 may be from 2015 and 18 from 2011. I don't see how to get the zoom level directly, but using the scale factor and the tool from&nbsp;<A href="https://developers.arcgis.com/documentation/mapping-apis-and-services/reference/zoom-levels-and-scale/" target="_blank" rel="noopener">https://developers.arcgis.com/documentation/mapping-apis-and-services/reference/zoom-levels-and-scale/</A>&nbsp;I can get a scale factor assigned with a zoom level. What I need is the converse of that: given some arbitrary scale factor, what zoom level is used?</P><P>Zoom level 17 is associated with scale factor 4513.988705<BR />Zoom level 18 is associated with scale factor 2256.994353</P><P>However I've found that with scale factor 1:3209, the image returned is from zoom level 18; with scale factor 1:3210, the image returned is from zoom level 17, the the break is somewhere in between the 2 (but not exactly halfway).</P><P>Any information on how to precisely determine the zoom level for any given scale would be greatly appreciated.</P> Wed, 31 May 2023 14:10:33 GMT Chris_Musial 2023-05-31T14:10:33Z https://community.esri.com/t5/arcgis-image-server-questions/determine-zoom-level-for-an-arbitrary-scale/m-p/1294481#M1674 <P>I am trying to obtain the acquisition date for an image form the standard imagery basemap from ArcGis Online. This image service consists of multiple 'sub-layers' for different zoom levels, and these 'sub-layers' may have been acquired at different times. For example levels 14-17 may be from 2015 and 18 from 2011. I don't see how to get the zoom level directly, but using the scale factor and the tool from&nbsp;<A href="https://developers.arcgis.com/documentation/mapping-apis-and-services/reference/zoom-levels-and-scale/" target="_blank" rel="noopener">https://developers.arcgis.com/documentation/mapping-apis-and-services/reference/zoom-levels-and-scale/</A>&nbsp;I can get a scale factor assigned with a zoom level. What I need is the converse of that: given some arbitrary scale factor, what zoom level is used?</P><P>Zoom level 17 is associated with scale factor 4513.988705<BR />Zoom level 18 is associated with scale factor 2256.994353</P><P>However I've found that with scale factor 1:3209, the image returned is from zoom level 18; with scale factor 1:3210, the image returned is from zoom level 17, the the break is somewhere in between the 2 (but not exactly halfway).</P><P>Any information on how to precisely determine the zoom level for any given scale would be greatly appreciated.</P> Wed, 31 May 2023 14:10:33 GMT https://community.esri.com/t5/arcgis-image-server-questions/determine-zoom-level-for-an-arbitrary-scale/m-p/1294481#M1674 Chris_Musial 2023-05-31T14:10:33Z