How Terrain Pyramid Level Definition (3D Analyst) works
The Add Terrain Pyramid Level tool adds new pyramid level(s) to an existing terrain dataset.
The Pyramid Level Definition window defines the z-tolerance or window size and reference scale of one or more pyramid levels to be added to the terrain dataset.
The z-tolerance or window size can be specified as a floating point value. The reference scale must be provided as a whole number (e.g., a value of 24,000 represents a scale of 1:24,000)
The values are given in space-delimited pairs: one pair for each pyramid level. A pyramid level of 2.5 and a scale threshold of 1:10,000 would be entered into the definition window as: 2.5 10,000.
The example in the table below demonstrates setting terrain pyramid levels for a z-tolerance pyramid type.
|
Pyramid Level |
Z - Tolerance |
Reference Scale |
Definition Window Entry |
|---|---|---|---|
|
1 |
0 |
1:1000 |
0 1000 |
|
2 |
1 |
1:5000 |
1 5000 |
|
3 |
2.5 |
1:10000 |
2.5 10000 |
|
4 |
5.0 |
1:25000 |
5 25000 |
|
5 |
10.0 |
1:50000 |
10 50000 |
Using the settings above, the full resolution data is used in map displays up to a scale of 1:1,000. Between display scales of 1:1,000 and 1:5,000, only the data necessary to achieve an approximate vertical tolerance of 1.0, relative to the full-resolution data, is used. Between 1:5,000 and 1:10,000, only the data necessary to achieve an approximate vertical tolerance of 2.5, relative to the full-resolution data, is used. Between 1:10,000 and 1:25,000, a tolerance of 5 is used. For any scale smaller, a tolerance of 10 is used to display the terrain data.