GROUP: irrigation (ir)
DEFINITION: Irrigation and drainage ditches, sealed water storage, etc

Table of Contents

Classification

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  1. Object
    1. irrigation & drainage ditch = anthropogenic channels constructed to conduct either irrigation or drainage water, or both.
    2. water storage tank = impermeable tank or basin designed to hold water.
    3. wellhead = well and surrounding area within clear edges caused by management of the well, such as a sealed area or a compacted animal track created by use of animal traction for water pumping.
    4. bridge (>2m) = transportation across water, with water surface underneath.
    5. retention pond = engineered basin, usually earthen, but sometimes a mix of surfaces and structures designed to hold and infiltrate water as part of a sealed surface drainage system. May include trees or other vegetation. Edges defined by basin top edge. Note: FORM = RP.
  2. Modifier 1 (structure type)
    1. water storage tank
      1. open top = water surface >75% open to sky.
      2. covered = <25% of water surface open to sky.
  3. Modifier 2 (of building footprint)
    1. local roads, paths, & access
      1. wide >2 m

Key

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  1. irrigation & drainage ditch
    1. permeable = earth
      1. wide (>2m) = ir01
    2. sealed
      1. wide (>2m) = ir02
  2. water storage tank
    1. open top = water exposed
      1. small (<30m) = ir03
      2. large (>30m) = ir04
    2. covered = water covered by a permanent cover.
      1. small (<30m) = ir05
      2. large (>30m) = ir06
  3. wellhead
    1. permeable = ir07
    2. sealed = ir08
  4. retention pond = ir09

Dominance Rules

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  1. IF TYPE with greater area is very similar or otherwise unclear:
    1. Choose permeable over sealed.
    2. Choose open top over covered.
  2. IF feature includes a pump house with water tank:
    1. IF >50% area is water tank or the water tank area is similar to the pump house area, then classify as ir.
    2. IF clearly <50% of feature is water tank, then use GROUP = nb.
  3. IF paralleled by a <2 m transportation feature, and unclear which has greater width or feature area:
    1. Choose transportation over irrigation.

Factors

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Leaf Type: none
Leaf Time: none
Tree Cover: <10%
Vegetation Cover: <10%
Height: 0m
IGBP_DIS: ?Urban and built-up
Identification:
L1 Minimum: >2m linear, >5m polygon
L2 Minimum: >0.2m linear, >2m polygon

Compatible Classes

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FORM:

Anthropogenic Retention Pond

USE:

Constructed

COVER:

Sealed Bare soil Annual Mixed Perennial

TYPE:

Mapped Ecotopes

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ANCEir01 ANCEir07 ANCSir02 ANCSir03 RPCPir09  

Citation for AEM: Ellis E. C., H. Wang, H. Xiao, K. Peng, X. P. Liu, S. C. Li, H. Ouyang, X. Cheng, and L. Z. Yang. 2006. Measuring long-term ecological changes in densely populated landscapes using current and historical high resolution imagery. Remote Sensing of Environment 100(4):457-473.