Georeferencing an Adobe Illustrator document with MAPublisher

If you are using an existing Adobe Illustrator file that was created without the use of MAPublisher, then it does not contain any geographic parameters. The following step will enable you to georeference your Adobe Illustrator document and ultimately create an attribute-rich, accurate scale and world grid structure for your map. Please familliarize yourself with the main MAPublisher functions and in particular those in the MAP Views section of the MAPublisher User Guide (chapter 4) before proceeding. Before beginning to georeference an Adobe Illustrator file, you must be in posession of the following information: To determine the real world scale of your map, use the scale bar drawn on the map for reference (measure the page size using the Adobe Illustrator Measure tool or MAPublisher meaurement tool and divide by the scale size indicated - make sure to use the correct measurement units). If no scale bar is available, try measuring distances in page units in Adobe Illustrator and compare with the same distance measured in real units with mapping or GIS software, beware that differences in coordinate systems may affect the distance measurements. Determining the coordinate system of the map may be difficult. If no information is provided as metadata or in the map legend, try to compare with other maps of the same area or with traditional coordinate systems used in the area (e.g. US State Plane zone matching a county name in the USA). Below is an example of the coordinate system shown on an existing map. The coordinate system of the map is UTM (Universal Transverse Mercator) Zone 18. The projection used for the map is Transverse Mercator and the geodetic system used for the map is NAD (North American Datum) 1983. The XY coordinates of one tie-in point is called a MAP Anchor point in MAPublisher. The purpose of the MAP Anchor point is to make a connection between a real world coordinate and an Adobe Illustrator document page anchor. To determine a tie-in point, find a specific location in your document for which a real world coordinate location is known or can be easily determined (such as known feature or grid or graticule crossing positions). If grid or graticule lines are not available on the map, you may find a known location such as an intersection of roads and a corner of a building. Record the location of this point in real world coordinates. You can use the values from Eastings and Northings or latitude and longitude if the map is in a projected coordinate system. Below is an example of the selected anchor point based on the grid lines along the projected coordinate system: (400000 and 5350000 metres for the eastings and northings, respectively). The coordinate values from the document can be obtained from the Info panel (Window >, Info from the Adobe Illustrator menu). Simply open the Info panel and place the mouse on the point where the XY coordinate values were collected earlier. For this example, the XY coordinate values for the document is 0.553 and 0.894 (inches) for X and Y, respectively. MAPublisher uses the rotation angle value based on the angle of the north arrow, more specifically the true north (cartographic north). If the north arrow of the map is pointing the top of the document (with a right angle), the map in your document has no rotation angle (MAP (A) below - rotation: 0 degree). If the north arrow on the map is tilted, the map of the document has a rotation value with it (MAP (B) and (C)). When the north arrow angle moves clockwise, the rotation value will be negative (MAP (B) below - rotation: -20 degree). When the north arrow angle moves counter-clockwise, the rotation value will be positive (MAP (C) below - rotation: 161 degree). I have a map in PDF format that was created a few months ago. I opened the file in Adobe Illustrator and (as expected) there is no georeference information because it was not created with MAPublisher. To georeference the document, I'll begin to collect the four key pieces of required information. When I looked at the map very closely, one section of the map indicates the georeference information we need. Now that all the required information is collected, let's make this map georeferenced using MAPublisher. The Adobe Illustrator document now has the appropriate georeference information and each of the layers now becomes a MAP Layer. From this point, you can add attribute information to MAP Layers, continue to edit features, import new GIS data layers, export MAP Layers to popular GIS formats or convert the map to a geospatial PDF to use it with PDF Maps app for iPhone, iPad, and iPod. Source.


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Last Modified: January 31, 2013 @ 12:00 am