Available with Advanced license.
To create an ortho mapping workspace for processing your drone images, you will need two files with information about your drone imagery: the geolocation information and the camera information.
The image Geolocation information includes information about the drone imagery, such as latitude, longitude, and altitude. The geolocation is normally stored in the image EXIF metadata, but if this is not available, you need to provide a GPS text file (such as .csv) that defines the image geolocation. The information required in the GPS file includes Image Name, Latitude, Longitude, and Altitude, and optionally Omega, Phi, and Kappa.
The Camera Model file (interior orientation) contains information that will be automatically determined based on the camera name that is read from the EXIF header. If the camera is unknown to the system, you can enter the camera parameters.
The Spatial Reference will be automatically determined from the GPS location of the data, using the appropriate UTM zone. You may modify it if you have a projection that fits your study area.
The altitude can be in Above Mean Sea Level (AMSL) or Above Mean Terrain (AMT). You may also provide an average flight height for all your images. For each case, you will need to provide a constant elevation for your study area or provide a DEM from the Data Loader Option pane.
Create an ortho mapping workspace from drone imagery
- On the Imagery tab, click New Workspace.
- On the Workspace Configuration page, type a name for your workspace.
- Use the Workspace Type drop-down arrow to choose Drone.
- Click Next.
- On the Image Collection page, click the Add button to browse and load all the drone imagery for this project.
If your imagery has the proper metadata in its EXIF headers, the Geolocation and Camera Model parameters are automatically populated.
- If the Geolocation information was not automatically populated by the EXIF header information, browse to the geolocation file that your vendor should have provided with the drone imagery.
- Spatial Reference should be automatically populated with the GPS location of your data. Click the spatial reference icon if you want to change the spatial reference.
- If the Camera Model information was not automatically populated by the EXIF header information, click the Browse button for the Camera Model parameter. This opens the Edit Camera Parameters options page.
- Choose the correct Camera File with the camera model information. This can be a .cam file or a .csv file. If neither is available, you can manually enter the camera parameters on this page.
- Click the Back button to return to the Image Collection page.
- Optionally, click the Data Loader tab to further refine your output drone workspace.
- Choose your Elevation Source.
- Average Elevation from DEM—Use the average elevation from the specified DEM.
- Constant Elevation—Use the Constant Elevation value specified.
- DEM—Use the DEM values for each pixel. You can also specify Z Factor and Z Offset values.
- Check the Estimate Statistics check box to estimate the statistics for your output drone workspace.
- Edit the Band Combination parameters, if you want to reorder the band combination from the default order.
- Choose either of the Pre-processing options to Calculate Statistics or Build Pyramids on your data before your create your workspace.
- Choose your Elevation Source.
- Click Finish to create the workspace.
When the ortho mapping workspace is created, the image collection will be loaded in the workspace and displayed on the map. You are now ready to perform adjustments and generate ortho products.