The solution to the blank situation of ArcGISPro mosaic dataset importing multi-source large-scale raster data
question
When using ArcGIS to test the service publishing and slicing of some regional data, there is no problem, but when testing the image data and terrain of the whole province, the image data provided here is three-tone data, and large quantities of data are planned to be mosaic The dataset publishes services and slices, but follow the normal process, create a mosaic dataset - build pyramids and statistical data - define the NoData value of the mosaic dataset - build an overview map, so that some data browsing blanks will appear in the overview view, only zoom in to a super large It will be displayed normally under the scale
reason
Because the data sources are different, and the province-wide data has been accumulated for a long time, the data resolution is different and the display effect is different. The construction overview exceeds its MaxPS value, so the PS is not displayed: MinPS
and
MaxPS Attributes
Define the pixel size range, adjust the display resolution, lower than MinPS and higher than MaxPS cannot be displayed
LowPS and HightPS
LowPS is the actual resolution of the image, HightPS is the resolution of the image pyramid
Pixel size:
By default, the tool The base pixel size used to generate the overview is automatically calculated. We can also create overviews starting from a specific resolution.
For example, adding high-resolution raster data with a huge amount of data to a mosaic dataset actually only requires an overall mosaic effect with a general resolution, so it can be adjusted to an appropriate cell size.
Solution:
1. Conventional solutions
This is the solution provided by Baidu. For details, please refer to http://zhihu.geoscene.cn/question/14162
1. First, ensure that the pyramid, statistical data, and overview view have been constructed; 2. If the number of images is relatively large, you can mosaic the data Set in the right-click property of the set: set the number corresponding to the parameter Maximum_Number_of_Rasters_per_Mosaic under default, and adjust it to an appropriate number. 3. If we keep shrinking the map and the final requested Cell Size is greater than the total MaxPS, the request will fail and a black and white checkerboard pattern will be returned. That is, the cell size range of the mosaic dataset directly affects the visibility of the imagery data when we zoom the map. Check the pixel value of the image that is not displayed. Under the scale that the image cannot be displayed, calculate MaxPS according to the formula and increase MaxPS. (Open the editor and modify the MaxPS of the corresponding scene data in the footprint attribute table): CellSize = Scale * 0.0254 / 96.
However, it is not suitable for this kind of situation, because the data sources are complex, the resolutions are different, and the data is irregular. It is spliced one by one. If you modify the images that are not displayed one by one, the workload is too large.
2. Resample the data
Use the resampling tool to change the pixel size of the data to be consistent, keep it under the same pixel, and build an overview. However, this method is not feasible for large batches of data. First, resampling takes a long time and the efficiency is too low. Second, the data needs to be saved separately, which occupies too much memory.
3. The final solution
Exploring the reason is controlled by the MaxPS value, still follow the previous steps: create a mosaic dataset - build pyramids and statistical data - define the NoData value of the mosaic dataset, in this step, add the mosaic dataset
to the map, in the map Right-click the mosaic dataset, open the attribute table, right-click MinPS and MaxPS in the attribute table, change the MinPS value to 0 through the calculation field, and change the MaxPS value to the smallest MaxPS value in the source data, such as the smallest MaxPS in this data The value is 0.0001, we will change the MaxPS value of all data to 0.0001
Afterwards, right-click the mosaic dataset, select Define Overview in the optimization section, expand the slice parameters of the overview, and fill in the MaxPS value set in the previous step in the cell size to keep it consistent. For example, I set 0.0001 in the previous step, then in The pixel size here should be 0.0001. Others should be kept as default. Click Run. After the operation is successful, rebuild the overview view, so that the resulting image will not appear blank at each scale.
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