Released from the CA Department of Fish and Game – thank you Drew Decker for passing along!
DFG is now offering California-statewide aerial imagery and topo map services for public use from its ArcGIS Server environment. Currently offered services include:
- California 2005 CIR aerial imagery in 2 variations (CIR/false color, NDVI)
- NAIP 2005 aerial imagery (natural color)
- NAIP 2009 aerial imagery in 4 variations (natural color, CIR/false color, NDVI, 4-band)
- Topo maps in 4 different renderings (grayscale, hillshaded, regular, transparent background)
All the services are delivered in "Web Mercator" WGS84 which is compatible with Google Maps, Bing Maps, and newer ArcGIS Online services. When using ArcMap, it will on-the-fly project the services to whatever coordinate system is set in the ArcMap data frame.
We welcome your feedback on the value and speed of these services. Access instructions and additional details are provided below.
How to access the services using ArcGIS layer files:
This approach generally requires ArcGIS 9.3.1 (9.3 and earlier may work for some services). Use the self-titled ArcGIS layer files downloadable in a zip file from this site:
After unzipping the zip file, add the layer files directly to ArcMap using the "Add Data" option.
How to access the services using ArcGIS - GIS Server connection:
This approach generally requires ArcGIS 9.3.1 (9.3 and earlier may work for some services). A GIS Server connection can be created in ArcCatalog to access the services as needed. In the ArcCatalog left panel expand "GIS Servers", then click "Add ArcGIS Server" and in the first panel choose "Use GIS Services". In the next panel choose "Internet" connection and enter this as the Server URL: http://imaps.dfg.ca.gov/arcgis/services Then click "Finish". This will create a connection named "arcgis on imaps.dfg.ca.gov" that can expanded and then browsed for services. Choose the self-titled service that you want and then drag and drop it into ArcMap. Or, start ArcMap and then use the "Add Data" option to navigate to the connection and select a service.
How to access the services from the REST Services Directory:
Accessing the following URL in a web browser will allow you to browse available services and add some of them directly to applications such as ArcMap, ArcGIS Explorer, and Google Earth.
For example, clicking on the "Base_Remote_Sensing" folder and then the "Base_Remote_Sensing/NAIP_2009" service will bring up some basic information about the service and a link to "View In: Google Earth".
Service metadata / descriptions:
Once added to ArcMap, basic descriptive metadata for some of the services can be accessed from the Layer Properties - General Tab - Description box. Here are additional details about the services based on their service names:
California_CIR_2005 - This service delivers color infrared (CIR) imagery acquired during NAIP flights for California in the summer of 2005. CIR coverage was not available in all areas.
California_CIR_2005_NDVI - This experimental service delivers a Normalized Differential Vegetation Index (NDVI) rendering of the CIR 2005 imagery for general assessments of vegetation health and biomass. The color-ramp goes from brown (less healthy vegetation) to red to green (healthier vegetation or more "greenness"). More information about the NDVI process used is available here:
NAIP_2005 - This service delivers 2005 natural color imagery in a compressed format.
NAIP_2009 - This service delivers 2009 natural color imagery in a compressed format.
NAIP_2009_4Band - This service delivers all 4 bands of the 2009 imagery (R,G,B,IR) in an uncompressed format for those who want full access to the source data for analyses. This service is slower than the others because of the amount of data being served.
NAIP_2009_CIR - This service delivers color infrared (CIR) / false color imagery in a compressed format. CIR imagery is useful for various purposes, including vegetation mapping.
NAIP_2009_NDVI - This experimental service delivers a Normalized Differential Vegetation Index (NDVI) rendering of the 2009 imagery for general assessments of vegetation health and biomass. The color-ramp goes from brown (less healthy vegetation) to red to green (healthier vegetation or more "greenness"). More information about the NDVI process used is available here:
Topo_Grayscale - This service provides seamless display of topographic map datasets in grayscale colors.
Topo_Hillshade - This service provides seamless display of topographic map datasets integrated with hillshade/relief data for enhanced topographic display.
Topo_Regular - This service provides seamless display of topographic map datasets in regular colors.
Topo_Transparent - This service provides seamless display of topographic map datasets with a transparent background - useful for draping over other data such as aerial photography. The white pixels and other selected background data are rendered transparent while other features such as place names and hydrography display in regular colors. The transparency effect may only work in particular software such as ArcMap.
How to access the services in older versions of ArcGIS or other applications:
This approach is for older versions of ArcGIS that do not support the access instructions mentioned above, or for other applications that support WMS access. Here are the URLs for the services described above (note each particular service name embedded in the URLs). In ArcCatalog, use the "Add WMS Server" option to create connections and add the services.