Available with Advanced license.
The Custom Products wizard provides a flexible guided workflow for generating your ortho mapping products. For example, you can generate a digital elevation model (DEM) and an orthomosaic at the same time, using the Custom Products wizard. You can also generate a mosaic by disabling steps that are not needed for your workflow, such as turning off color balancing if the image colors are already homogeneous.
Product Generation Settings page
The Product Generation Settings page allows you to specify the ortho mapping products you want to create. The wizard allows you to create a digital elevation model (DEM), an orthomosaic, or both. Check the products you want to create. Each ortho mapping product also has options to perform specific tasks during its creation. The following table lists the options on the Product Generation Settings page:
Digital Elevation Model
Check this box to create a DEM ortho product.
You will need to complete the options in the Point Cloud Settings page. If you do not check the Interpolate DEM from Solution Points check box, you will also need to complete the options in the DEM Interpolation Settings page.
Interpolate DEM from Solution Points
Check this box to create your DEM by interpolating from solution points. When you check this box, you only need to complete the Point Cloud Settings page.
Check this box to create an orthomosaic product.
Check this box to build seamlines during the orthomosaic creation. If you choose to build seamlines, you will need to complete the Seamline Settings page.
Check this box to color balance the image collection during the orthomosaic creation. If you choose to color balance, you will need to complete the Color Balance Settings page.
Check this box to create a raster dataset output for the orthomosaic. If you choose this option, you will need to complete the Orthomosaic Settings page.
Point Cloud Settings page
The following table lists the parameters on the Point Cloud Settings page:
Parameters for Point Cloud Settings
The matching method for generating a point cloud:
Maximum Object Size to Filter (in meters)
A search radius used to filter out objects above ground. Objects smaller than the threshold are filtered as ground; otherwise objects are treated as above-ground features such as buildings, bridges, or trees.
Point Ground Spacing (in meters)
Defines the spacing, in meters, at which the 3D points are generated.
The suggested spacing is five times the source image pixel size.
Minimum Intersection Angle (in degrees)
The point cloud is generated from stereo pairs. This value defines the minimum angle the stereo pair must meet. The default is 5 degrees.
A stereo pair with an intersection angle that is too small will produce unstable results when triangulating 3D points.
Maximum Intersection Angle (in degrees)
The point cloud is generated from stereo pairs. This value defines the maximum angle the stereo pair must meet. The default is 70 degrees.
A stereo pair with an intersection angle that is too large will produce few or no match points.
Minimum Area Overlap
The percentage of overlapping area over the entire image. The default is 0.6.
Maximum Omega/Phi Difference (in degrees)
The maximum threshold for the Omega and Phi difference between the two image pairs. The Omega values and Phi values for the image pairs are compared. If the difference between either the two Omega or the two Phi values is above the threshold, the pairs will not be formatted as a stereo pair.
Maximum GSD Difference
The threshold for the maximum ground sample distance (GSD) between two images in a stereo pair. If the resolution ratio between the two images is greater than the threshold value, the pairs will not be built as a stereo pair. The default value is 2.
Number of Image Pairs
The number of pairs used to generate 3D points. For a project that has dense overlaps and many stereo pairs, increasing this number means more computation time. The suggested value is 4.
Sometimes a location may be covered with many image pairs. In this case, the tool will order the pairs based on the various threshold parameters specified in this tool. The pairs with the highest scores will be used to generate the points.
The parameters that affect the order of the stereo pair, in addition to Minimum Intersection Angle, Maximum Intersection Angle, and Minimum Area Overlap, can also include Maximum Omega / Phi Difference, Maximum GSD Difference, and Adjustment Quality Threshold.
Adjustment Quality Threshold
Specify the minimum adjustment quality that is acceptable. The threshold value is compared to the adjustment quality value that is stored in the stereo model. Image pairs with an adjustment quality less than the specified threshold receive a score of 0 for this criteria and will descend in the ordered list. The values for the threshold ranges from 0 to 1. The suggested value is 0.2.
- Heiko Hirschmuller et. al., "Memory Efficient Semi-Global Matching," ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume 1-3, (2012): 371-376.
- Hirschmuller, H. "Stereo Processing by Semiglobal Matching and Mutual Information." Pattern Analysis and Machine Intelligence, (2008).
DEM Interpolation Settings page
The following table lists the parameters on the DEM Interpolation Settings page:
Parameters for DEM Interpolation Settings
Create a digital terrain model or a digital surface model.
The pixel size for the DEM.
The output pixel size should be the same or larger than the pixel size of source image. You can enter a value to be multiplied by the Ground Sample Distance (GSD), which is the source pixel resolution, or you can enter an explicit Value which represents the size of the pixel in units that match the source imagery.
The format for the output raster dataset:
The compression method for the output DEM. The following options will be available based on the Format you choose:
The method used to interpolate the output raster dataset from the point cloud.
The filter to smooth the output raster dataset.
Fill Missing Pixels Using
A DEM input that is used to fill NoData areas.
Areas of NoData may exist where stereo overlap is insufficient, or no matching points are found in the area during point cloud generation.
Orthorectify images using DEM
This parameter will update the orthorectification process in the image collection. Check the check box to orthorectify the image collection using the DEM generated using the wizard. If you don't want to replace the current elevation model with the newly generated DEM, uncheck the check box.
Check the check box only when you are sure that the DEM output is acceptable and you do not need to generate it again.
If you have another DEM to use to orthorectify the image collection, you can enter it on the Orthomosaic Settings page.
Color Balance Settings page
The following table lists the parameters on the Color Balance Settings page:
Parameters for Color Balance Settings
Select Mosaic Candidates
The Select Mosaic Candidates parameter is typically used for image collection with dense overlaps such as drones. It is used to find an optimum set of images that can be used when mosaicking images. The selected images will be used in seamline building, color balancing, and output mosaic operation.
Specifies the color balancing algorithm that will be used.
Color Surface Type
If the Dodging balance method is used, each pixel needs a target color, which is determined by the surface type.
The raster that will be used as a target to color balance the image collection. It can be a raster dataset, a mosaic dataset, or an image service. The statistics required by the balance method and color surface type, if applicable, will be derived from this target image.
Once color balancing has been performed, there may be new pixel values in the raster. Check the check box to calculate the statistics with the latest pixel values.
Number of Columns to Skip
The number of horizontal pixels to skip between the samples used to calculate statistics. The value must be greater than zero and less than the number of columns in the raster. The default is 1.
Number of Rows to Skip
The number of vertical pixels to skip between the samples used to calculate statistics. The value must be greater than zero and less than or equal to the number of rows in the raster. The default is 1.
Seamline Settings page
The following table lists the parameters on the Seamline Settings page:
Parameters for Seamline Settings
The computation method that will be used to generate seamlines.
The pixel size that will be used for seamline generation. A mosaic dataset may contain raster items with different resolutions. Use this parameter to designate the pixel size for generating seamlines.
Minimum Region Size
Specify the minimum region size, in pixel units. Any polygons smaller than this specified threshold will be removed in the seamline result. The default is 100 pixels.
Blend Width Units
Specifies the unit of measurement that will be used for the blend width.
Blending (feathering) occurs along a seamline between pixels where there are overlapping rasters. The blend width defines how many pixels will be blended.
If the blend width value is 10, and you use BOTH as the blend type, then 5 pixels will be blended on the inside and outside of the seamline. If the value is 10, and the blend type is INSIDE, then 10 pixels will be blended on the inside of the seamline.
Specifies the method that will be used to blend one image into another over the seamlines.
Request Size Type
Specifies the units that will be used for the Request Size value.
Specify the number of columns and rows for resampling. The maximum value is 5,000. Increase or decrease this value based on the complexity of your raster data. Greater image resolution provides more detail in the raster dataset but also increases the processing time.
Sliver Removal Options
Minimum Thinness Ratio
Define how thin a polygon can be, before it is considered a sliver. This is based on a scale from 0 to 1.0, where a value of 0.0 represents a polygon that is almost a straight line, and a value of 1.0 represents a polygon that is a circle.
Slivers are removed when building seamlines.
Maximum Sliver Size
The maximum size a polygon can be to still be considered a sliver. This parameter is specified in pixels and is based on the Request Size value, not the spatial resolution of the source raster. Any polygon that is less than the square of this value is considered a sliver. Slivers are removed when building seamlines.
Orthomosaic Settings page
The following table lists the parameters on the Orthomosaic Settings page:
Parameters for Orthomosaic Settings
The pixel size that will be used for the orthomosaic.
Specifies the output format that will be used for the orthomosaic.
Specifies the compression method that will be used for the output. The available options will be based on the Format value.
Orthorectify Source Image Collection Using
The digital elevation model (DEM) that will be used to orthorectify the orthomosaic. Options include the reference DEM for the workspace, a DEM generated using the DEMs Wizard, or an external DEM.
Only Orthorectify Source Image Collection
Checked—Only the individual images in the image collection are orthorectified. An orthomosaic is not generated.
Unchecked—An orthomosaic is generated.