Vegetation Mapping in the SHIFT Domain

Overview

This page shows an overview of some vegetation mapping efforts in the domain of the Spring 2022 NASA SHIFT campaign.

The Data

All data shown here are uploaded to Google Drive at the links below.

Base directory: SedgwickShare_FrankDan > SHIFT_VegMap

Current versions:

• Data in 'v0_data' subfolder

• Initial products in 'v0_S2_GrassSegmentation' subfolder

Analysis

Figure 1. Temporal sampling.

Calendar plot below shows Landsat 8-9, Sentinel-2 and AVIRIS-ng acquisions for period Sep 1, 2021 through Aug 31, 2022. Colors indicate cloudcover: blue is cloud-free, red is too cloudy to be usable. Done by visual interpretation with reasonably strict threshold of acceptability. Sentinel-2 tile T10SGD; Landsat p042r036.

Note Planet data are additionally available (3m, daily revisit).

Sentinel-2: 12 of 73 cloud-free
Landsat 8-9: 8 of 35 cloud-free
AVIRIS-ng: 16 unique dates (overestimate; not full coverage on all dates)

Fig 2. Simple Temporal Mixture Model

Below. Red = annual, green = evergreen, blue = deciduous/shadow. Not shown - null (unvegetated). Linear stretch 0 to 1.

Full Area Grass Masks - Max Probability Rule

Below. White areas have maximum probability of Annual tEM.

Full Area Grass Masks - Progressive Threshold

Below. Red > 30% , Green > 50%, blue >70%. Binary masks.

Sedgwick Grass Masks - Max Probability Rule

Below. White areas have maximum probability of Annual tEM.

Sedgwick Grass Masks - Progressive Threshold

Below. Red > 20% , Green > 50%, blue >70%. Binary masks.

Sedgwick 3D UMAP - Grasses

Below. Red =UMAP dimension 1, green = UMAP dimension 2, blue = UMAP dimension 3. Linear stretch.

Sedgwick 3D UMAP - Shrub/Tree

Below. Red =UMAP dimension 1, green = UMAP dimension 2, blue = UMAP dimension 3. Linear stretch.

Sedgwick NearMap example - SW Corner

Approx. 7cm resolution. True color.