{| style="border:2px solid lightgray; float:center; margin:10px;"|align="left" style="padding: 5px 10px 5px 10px"|[[Image:bulb2.png|25px|Represents a tip or {note for using IMSMA.]]|align="left" style="padding: 5px 10px 5px 10px"| Note that these procedures are done outside of IMSMA{{IMSMANG}}. The recommended maximum size of the background map is 2 GB. If you would need a clean background map then you may download it from '''[[Downloads]]'''.|}}
Major All modifications to the IMSMA {{IMSMANG}} background maps must be performed in an external desktop GIS application such as [http://desktop.arcgis.com/en/desktop/ ArcMap 910.x1]. To change existing maps:#Close the IMSMA client.#Copy any new all layers to the ''<IMSMA Installation Directory>''\server\gis\maps\a folder ''Map_Name'ouside' directory, where ''Map_Name'' is the name of the map that you would like to change.#Open the .mxd file from the ''<IMSMA Installation Directory>''\server\gis\mapsC:\''Map_NameIMSMAng'' folder.#Change the map .MXD file as needed. From ArcMap you canExample of edits:
#*Set minimum and maximum display levels for each layer
#*Add, modify, and remove delete raster and vector layers
#*Change the map coordinate system
#*Create pyramids for raster layers
#*Change colours and styles
#*Add, modify, or remove delete labels from vector layers
#*Group and ungroup layers
#:Although ArcMap an external GIS application allows you to make other changes to the map, the changes listed above are the ones that can be viewed with IMSMA{{IMSMANG}}.#Verify that '''all''' layers and the map frame has the same projection.#Save the .MXD file with a '''new''' name. Remember to use '''relative''' path to data sources in the map document (mxd ).{{Warning| {{IMSMANG}} may '''only''' use mxd files that are created in 10.1 format. In ArcMap use '''''Save a copy''''' and choose ''ArcMap 10.1 and ArcMap 10.2 format''.}}#Import the new .MXD file .#Test the new .MXD with {{IMSMANG}} and exit ArcMapevaluate performance.#Restart Share the IMSMA clientnew .MXD file and '''all''' layer files.