Columbia subject headings:
Agriculture--Remote sensing--Congresses.
Forests and forestry--Remote sensing--Congresses.
Hydrology--Remote sensing--Congresses.
Land use--Remote sensing--Congresses.
Harvard subject headings:
Princeton subject headings:
Agriculture--Remote sensing--Congresses.
Forests and forestry--Remote sensing--Congresses.
Hydrology--Remote sensing--Congresses.
Natural resources--Remote sensing--Congresses.