Imported maps can be very helpful when setting up a model scenario and analyzing the results. They can be used as a QA/QC method for ensuring that model objects are in the correct locations and they can also help better visualize results graphically. Although a map file image is not required, BREEZE ROADS makes it so easy to import maps that it will become a routine step in your model setup and analysis.
Once the projection for the modeling scenario is set and the Import Image button is selected, the steps listed in the Importing a Base Map Image File section can be used to import an image file using a reference point and known distance between two points in BREEZE ROADS.
Selecting the Projection and the Import Image Button
- Set the Projection for the ROADS scenario to the appropriate coordinate system. This can be defined in Set View dialog which is accessed through the Map Menu or the Set View button on the toolbar.
- To import a base map into ROADS navigate to the Tools menu and select import image from the drop down menu.
- Once you have selected to import an image, the following Import Image screen will appear and walk you through five steps.
- Step 1: Select the image file that you want to import. Once selected, the image will be shown in the preview area. Click Next.
- Step 2: Enter the degree of rotation for the image or leave it set to 0 degrees if no rotation is necessary. Click Next.
- Step 3: Set the reference point by clicking on the image with the mouse and providing the associated coordinates for that location. Once the reference point is clicked, the Image X and Image Y fields will automatically populate. Then, input the UTM coordinates into the Easting and Northing fields for that specific reference point. You may use the Convert LL/UTM button to convert the Latitude and Longitude coordinates to UTM. Click Next.
(Tip: You may use a tool like Google Earth to obtain the coordinates of a certain point if you do not have them readily available.)
- Step 4: Set the distance scale by clicking on the map for the first and second points and then provide the known distance between the two. When you click the two specific locations on the map, Image X1, Y1, X2, and Y2 will automatically populate. Using a tool like the Ruler in Google Earth, determine the distance in meters between those two locations and enter it into the Distance field. Click Next.
- Step 5: Select the format of the image that the base map will be saved as.
If the image does not automatically appear in your Map view, you can select the View Extent button to view all objects in the Map View as well as any base maps that have been imported:
View of Imported Map in BREEZE ROADS
Follow these steps to import each image file. If you import more than one image and want to change the order in which they are overlaid (e.g., if you want to show the base map image over an aerial image), you can go to Map Manager in the Tools menu and select the Up and Down buttons to rearrange the order.
If you have questions when importing base maps, please click Help to access the user guide or contact the BREEZE Support Team via email at firstname.lastname@example.org or phone +1 (972) 661-8881.