Geoida very slow loading geoid file
Question: My job covers a very large area (thousands of square kilometres); when Geoida is loading the geoid file or is re-sizing it because of new points, it becomes very slow and takes some time for the progress bar to get to 100%.
Answer: The size of a sub-set of geoid data windowed from the primary geoid file increases according to the area of the job covered, ie if the dimensions of the area covered double in both east-west and north-south directions then the area will be 4 times larger. The number of nodes contained depends on the grid interval, so if the grid interval is 1 minute, an area 1 degree in longitude by 1 degree in latitude will contain 60 x 60 nodes = 3600 and the windowed file size will be approximately 100800 kb in size; however an area 10 degrees by 10 degrees will contain 600 x 600 = 360000 nodes and file size will be 10080000 kb or about 10 mb and performance will be adversely affected.
To aid performance where geoid interpolations are required:
If geoid interpolation is not needed, turn off Apply Geoid in Job Configuration.
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