Geologic Conversion from Illustrator to ArcGIS (digitize method)
Note: This method describes how to start a map conversion from a published map to GIS.
Here we describe how to essentially flatten the published map as a raster which can then
be hand digitized. This should only be used if the publish map is deemed too difficult to
convert using plug-ins like Map Publisher or Canvas GIS which can convert the existing
vector features into GIS compatible formats.
1.) Download published map usually in Illustrator format (*.ai).
1.a) Open file in Illustrator and copy/paste Unit Name and Short Description to
Excel, save as DBF. Do the same with Structural types. This will be used to
"table to domain" into your geodatabase.
2.) Open with Photoshop, use 300 dpi, turn of anti alias if that doesn't work
3.) In Photoshop, flatten image, save out Png.
4.) clip out map, including the black edge of the grid, save out new Tiff.
5.) Order image from Map A Planet as Tiff. (We will eventually change this as PDS
format set Yes to GIS output), see image, km/pixel is just a guess to get an ordered
image at about 200 MB. For Venus, request FMap Left Look unless Right Look is better
at filling the gaps. The order below was for Quad 20 which is Mercator. For now, we
will need to generate the Wordfile (same a step 8).
6.) Create a boundary polygon shapefile in decimal degrees.
7.) Set the projection of the map on the ArcMap Data Frame, export boundary file in
8.) Register the clipped out Photoshop Tiff using the projected boundary file. This can be
done in ArcMap Image Registration Toolbar or using ArcView 3.x's QDIR - snap to
image to theme's extent, write out worldfile (I prefer using ArcView 3.x and QDIR).
9.) Check registration of Map-a-Planet file with Photoshop file.
10.) Create geodatabase then a Feature Dataset in projected meters, you can use the
geologic meters boundary file. Create a Feature classes for Geology, Structure and others
(for say stipple patterns or point locations like volcanoes) if necessary. Use ArcToolBox
to load Units and Structure Types into the Geodatabase domains (table to domain).