Contents
What is terrain occlusion?
The terrain occlusion bit is set when the desired terrain is not visible from the sensor due to intervening terrain (Landsat 8-9 only) and the dropped pixel bit is set when a pixel is dropped (Landsat 1-7).
What are Landsat 8 bands?
Landsat 8-9 Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS)
| Bands | Wavelength (micrometers) | Resolution (meters) |
|---|---|---|
| Band 5 – Near Infrared (NIR) | 0.85-0.88 | 30 |
| Band 6 – SWIR 1 | 1.57-1.65 | 30 |
| Band 7 – SWIR 2 | 2.11-2.29 | 30 |
| Band 8 – Panchromatic | 0.50-0.68 | 15 |
What is the difference between Landsat 7 and 8?
The Landsat-8 Operational Land Imager (OLI) has improved calibration, signal to noise characteristics, higher 12-bit radiometric resolution, and spectrally narrower wavebands than the previous Landsat-7 Enhanced Thematic Mapper (ETM +).
What kind of sensor is Landsat 8?
The Landsat 8 Operational Land Imager (OLI) is an optical multispectral push-broom sensor with a focal plane consisting of over 7000 detectors per spectral band.
How to check the occlusion of a BV tree?
What I basically do is cull all the extracted BV trees nodes against the current depth buffer and it takes a few frames but I then do this: to check the current occlusion of the BV tree node when I next update on the cpu, like I said it happens a few frames late but I can live with that for now.
When to use predication to cull a BV tree?
Right now I’m using Predication to cull my BV tree after I first cull it with a few different view frustums, to get different ranges of objects to pass on to other parts of the engine. Life is good it works and has been a big save for me!
Which is an example of an occlusion culling algorithm?
The octree enables hierarchical culling of occluded regions of the scene, and the Z pyramid enables hierarchical Z-buffering of individual primitives and bounding volumes. The Z-pyramid is thus the occlusion representation of this algorithm. Examples of these data structures are shown in Figure 3.
Why do I use a standard occlusion query?
Turns out after much testing that I should be using a standard occlusion query because I can read it back on the CPU, I found out by reading the MSDN doc that if I use the pred query with the hint flag then I cant read it back on the CPU and without the hint flag I had no point to use the pred query.