**LEDAPS Mid-Atlantic Disturbance Mosaics**

LEDAPS is releasing aggregated maps at 500m and 1/20^th^ degree
resolution. At present, these aggregates are only subsets along the
Mid-Atlantic region of the US. All products are in HDF-EOS format. The
product specifications are given here:

**1. 500m Lambert Product**

Projection: Lambert Equal Azimuthal

Pixel size: 500 meters

Radius of Sphere: 6370997

Longitude of origin: 100 00 00 W

Latitude of origin: 50 00 00 N

False easting: 0.0

False northing: 0.0

XY corner coordinates (center of pixel) in projection units (meters):

> Size xy=(1344,1762)
>
> Lower left: ( 1583250.0,-1468750.0 )
>
> Upper left: ( 1583250.0, -588250.0 )
>
> Upper right: ( 2254750.0, -588250.0 )
>
> Lower right: ( 2254750.0,-1468750.0 )

Data Layers

  ------- -------------------------------- ----------- ---------- --------------------
          **Layer**                        **Units**   **Bits**   **Scaling/format**

  1       \% cell area disturbed           percent     8          none (0-100)

  2       \% cell area regrown             percent     8          none (0-100)

  3       \% 2001 forest area disturbed    percent     8          none (0-100)

  4       \% 2001 forest area regrown      percent     8          none (0-100)

  5       Interval between TM, ETM         decimal     16         Years \* 1000
          acquisitions                     years                  

  6       TM acquisition date                          16         \[DOY\]\[YY\]

  7       ETM acquisition date                         16         \[DOY\]\[YY\]

  8       Not mapped                       percent     8          none (0-100)

  9       QA bits                                      8          See below

                                                                   
  ------- -------------------------------- ----------- ---------- --------------------

**2. 1/20^th^ Degree Product**

Projection: None (geographic)

Pixel size: 0.05 degrees

Lat/lon corner coordinates (center of pixel):

Size xy= (173,128)

> Lower left: ( 82:09:00.0 W, 35:00:00.0 N )
>
> Upper left: ( 82:09:00.0 W, 41:21:00.0 N )
>
> Upper right: ( 73:33:00.0 W, 41:21:00.0 N )

Lower right: ( 73:33:00.0 W, 35:00:00.0 N )

Data Layers

  ------- -------------------------------- ----------- ---------- --------------------
          **Layer**                        **Units**   **Bits**   **Scaling/format**

  1       \% cell area disturbed           percent     8          none (0-100)

  2       \% cell area regrown             percent     8          none (0-100)

  3       \% 2001 forest area disturbed    percent     8          none (0-100)

  4       \% 2001 forest area regrown      percent     8          none (0-100)

  5       Interval between TM, ETM         decimal     16         Years \* 1000
          acquisitions                     years                  

  6       TM acquisition date                          16         \[DOY\]\[YY\]

  7       ETM acquisition date                         16         \[DOY\]\[YY\]

  8       Not mapped                       XXX         8          XXX

  9       QA bits                                      8          See below

                                                                   
  ------- -------------------------------- ----------- ---------- --------------------

QA Bits Key:

Bit 0 -- regrowth somewhere

Bit 1 -- disturb somewhere

Bit 2 -- not changed somewhere

Bit 3 -- cloud somewhere

Bit 4 -- shadow somewhere

Big 5 -- snow somewhere

Bit 6: Landsat-4 data used (i.e. beware of a poor calibration)

Bit 7: entire cell contaminated with cloud/snow or shadow

Note: fill value= 0. When no bits are set, no valid data maps to the
output cell.

**3. 30-meter (scene pair based) disturbance map product.**

UTM projection (not reprojected from GeoCover, 8-bit).\
   - Layer 1:  disturbance map with separate values for:\
        - disturbed forest (biomass loss)\
        - regrown forest (biomass gain)\
        - no change\
        - not mapped (null, cloud, shadow)\
   - Layer 2 :  DI_diff image (rescaled to 8-bit)

Scaled as follows :

nearest_integer( 127.5 + (di_diff/4.679)\*20.0 );

\- Layer 3: TM fuzzy forest probability (8-bit scaled 0 to 100%)

\- Layer 4: ETM fuzzy forest probability (8-bit scaled 0 to 100%)

\- Layer 5 QA bits (8-bit)

bit 0 (lsb): regrowth

> bit 1: disturbance
>
> bit 2: filtered
>
> bit 3 : cloud
>
> bit 4 : shadow
>
> bit 5 : snow
>
> bit 6: sieve filtered
>
> bit 7 (msb) : fill

*Also add TM, ETM+ acquisition dates to product metadata*

*Total size \~ 225 MB*