LRO LOLA Gridded Data Record Albedo Counts (GDRDAC)
GDRDAC – Gridded Data Record Albedo Counts
Instrument: Lunar Orbiter Laser Altimeter
PDS Data Set ID: LRO-L-LOLA-4-GDR-V1.0
For more information about LOLA RDR and derived products, see the RDR Product SIS.
For more information about all LOLA products, see the LOLA Archive Volume SIS.
The Lunar Orbiter Laser Altimeter (LOLA) Gridded Data Record Albedo Counts (GDRDAC) data products are the data counts (samples per pixel) used to generate the albedo maps (GDRDAM). The products are derived from nominal mission data only (e.g. Lunar Reconnaissance Orbiter (LRO) nominal phases 1-13). The GDRDAC data products contain the binned, interpolated altimetric measurements on a uniformly-spaced grid.
A pixel in the GDRDAC product represents the mean value at the center of a region bounded by lines of constant longitude and latitude at integral numbers of degrees or fractions thereof, scaled and interpolated where necessary. The size of the products at higher resolutions requires that they be aggregated in subsets of global coverage. Global standard products use the Equirectangular map projection, also known as Simple Cylindrical, while the higher-resolution products afforded by dense polar coverage use the Polar Stereographic projection.
Equirectangular map-projected digital elevation counts
|
Product |
Pixel size (latitude) |
Number/size of tiles |
Bits per pixel |
|
LDAC_4 |
7.5808 km |
Global, 0-360 |
16 |
|
LDAC_8 |
3.7904 km |
Global, 0-360 |
16 |
|
LDAC_10 |
3.0323 km |
Global, 0-360 |
16 |
Polar map-projected digital elevation counts, N/S
|
Product |
Dimensions |
Pixel size |
Latitude range |
Bits per pixel |
|
LDAC_50S_1000M |
2532 x 2532 |
1000 x 1000 m |
+/- 50° to pole |
16 |
|
LDAC_50S_3000M |
844 x 844 |
3000 x 3000 m |
+/- 50° to pole |
16 |
LOLA GDRDAC products have the following file names:
productsuffix
where:
product = product name above
suffix = file type/extension
.IMG = image file
.LBL = detached PDS label
.JP2 = JPEG2000 file
_JP2.LBL = detached PDS label
In ODE, GDRDAC products have the following product IDs:
PRODUCT