California Department of Transportation
 

CALTRANS EARTH TECHNICAL INSTRUCTIONS

 

TOPICS

 

INSTRUCTIONS

Caltrans Earth and the Data Library are going through changes and will be replaced with new web services. Check back for changes as they are developed.

  • Caltrans Earth Tools

    Caltrans Earth is currently running via an API on a web browser.

    Current Web Browser Versions:
    • Internet Explorer 11

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  • Using Google Earth Plugin

    Current Version: 7.1.5.1557
    To check to see if you have current version

    Google announced they will be retiring their API and Plug-In software on December 12, 2015, currently only works in Internet Explorer.

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  • Caltrans Mapping Services

    Post Mile Lookup - To activate the postmile lookup tool check the box for the tool. The tool should deactivate when box is unchecked. When checked a menu box will appear with four choices. Click, Point, Line, and XY (Click is the default).

    • With Click, click on the map to find a Postmile. Clear Map button will clear the map of all results.

    • With Point, selection the information in the dropdowns. All information for a specific postmile is needed including the prefix or suffix (if there is a postmile location with a prefix or suffix on a route that has a number that is the same without, an inaccurate location will result), when all information is entered, and click the Validate button for results; Clear button will clear the form information; Clear Map will clear all the results on the map.

    • The menu for Line is similar with the Point menu, except there is a to and from location on a route. The postmiles can be in different counties along the same route, and click the Validate button for resultes; Clear button will clear the form information; Clear Map will clear all the results on the map.

    • With XY, enter a Latitude and Longitude location, and click the GET PM for postmile location; Clear Map will clear all the results on the map.


    Geodesic Measure - To activate the Geodesic Measure tool check the box for the tool. The tool should deactivate when box is unchecked. When checked a menu box will appear with the choice of results in feet (ft/ac) or meters (m/m2) (feet (ft/ac) is the default). Results will be either Length or Area depending on what you are measuring. When measuring and area, the Length will show the length of the last segment. To clear the map, click the Clear button.

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  • Working with the Table of Contents

    First you need to wait for the map to fully load. The Table of Contents lists of the Public Headings with a arrow on the left side. Click on the arrow to dropdown the layer list (when you click the arrow again, the layer list will close). All of the layers have a checkbox to activate when checked and deactivate when unchecked. When checked, you need to zoom into the map to view some of the layers. When the headings have the dropdown activated, to view other headings/layers, use the scroll on the menu.

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  • Viewing Metadata

    Click on the Layer's name label to bring up the metadata popup window that will include all available information for the layer including links to file type downloads.

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  • Viewing Item Description

    On the map, click on a layer's feature, and a popup window will appear with information pertaining to the line segment, polygon area, or point that is clicked.

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  • Planned Replacement for Caltrans Earth

    The Geospatial Enterprise Operations Branch is working on new web services for sharing data with the public.

    Current Web Services:
    Caltrans Web Map Gallery
    Public Postmile Query Tool
    • Stay tune for more...

    Data Download:
    Caltrans GIS Data Library
    • Stay Tune for Changes...

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Last Update: August 22, 2016