【解决啦~】关于WRF3.9以后的土地利用类型说明与疑问

sunzy025

By default, the geogrid program will interpolate land use categories from MODIS IGBP 21-category data. However, the user may select an alternative set of land use categories based on the USGS land-cover classification. Although the MODIS-based data contain 21 categories of land use, these categories are not a subset of the 24 USGS categories; users interested in the specific categories in either data set can find a listing of the land use classes in the section on land use and soil categories.




默认的土地利用类型是21个，我也查看了一下确实是21个。但是官网给的介绍是20个类型。请问大神，哪里可以知道这21个都是什么啊？

Table 1: USGS 24-category Land Use Categories

Land Use Category	Land Use Description
1	Urban and Built-up Land
2	Dryland Cropland and Pasture
3	Irrigated Cropland and Pasture
4	Mixed Dryland/Irrigated Cropland and Pasture
5	Cropland/Grassland Mosaic
6	Cropland/Woodland Mosaic
7	Grassland
8	Shrubland
9	Mixed Shrubland/Grassland
10	Savanna
11	Deciduous Broadleaf Forest
12	Deciduous Needleleaf Forest
13	Evergreen Broadleaf
14	Evergreen Needleleaf
15	Mixed Forest
16	Water Bodies
17	Herbaceous Wetland
18	Wooden Wetland
19	Barren or Sparsely Vegetated
20	Herbaceous Tundra
21	Wooded Tundra
22	Mixed Tundra
23	Bare Ground Tundra
24	Snow or Ice

Table 2: IGBP-Modified MODIS 20-category Land Use Categories

Land Use Category	Land Use Description
1	Evergreen Needleleaf Forest
2	Evergreen Broadleaf Forest
3	Deciduous Needleleaf Forest
4	Deciduous Broadleaf Forest
5	Mixed Forests
6	Closed Shrublands
7	Open Shrublands
8	Woody Savannas
9	Savannas
10	Grasslands
11	Permanent Wetlands
12	Croplands
13	Urban and Built-Up
14	Cropland/Natural Vegetation Mosaic
15	Snow and Ice
16	Barren or Sparsely Vegetated
17	Water
18	Wooded Tundra
19	Mixed Tundra
20	Barren Tundra

我查看的结果是：
LANDUSEF (-146764228)
    float,    1 x 21 x 60 x 73
    Number of attributes = 7
        FieldType = 104
        MemoryOrder = XYZ
        units = category
        description = Noah-modified 21-category IGBP-MODIS landuse
        stagger = M
        sr_x = 1
        sr_y = 1



哪位好心人知道的话，麻烦赐教了

weilin421

        rel_path =    nlcd2006_9s:nlcd2006_ll_9s/
        rel_path =   nlcd2006_30s:nlcd2006_ll_30s/
        rel_path =    nlcd2011_9s:nlcd2011_ll_9s/
        rel_path =       nlcd2006:nlcd2006_ll_30s/
        rel_path =       ssib_10m:ssib_landuse_10m/
        rel_path =        ssib_5m:ssib_landuse_5m/
        rel_path =      modis_15s:modis_landuse_20class_15s/
        rel_path =      modis_30s:modis_landuse_20class_30s/
        rel_path = modis_30s_lake:modis_landuse_20class_30s_with_lakes/
        rel_path =       usgs_30s:landuse_30s/
        rel_path =     usgs_lakes:landuse_30s_with_lakes/
        rel_path =    modis_lakes:modis_landuse_21class_30s/
        rel_path =        usgs_2m:landuse_2m/
        rel_path =        usgs_5m:landuse_5m/
        rel_path =       usgs_10m:landuse_10m/
        rel_path =        default:modis_landuse_21class_30s/

sunzy025

Table 2: IGBP-Modified MODIS 20-category Land Use Categories

Land Use Category

Land Use Description

1

Evergreen Needleleaf Forest

2

Evergreen Broadleaf Forest

3

Deciduous Needleleaf Forest

4

Deciduous Broadleaf Forest

5

Mixed Forests

6

Closed Shrublands

7

Open Shrublands

8

Woody Savannas

9

Savannas

10

Grasslands

11

Permanent Wetlands

12

Croplands

13

Urban and Built-Up

14

Cropland/Natural Vegetation Mosaic

15

Snow and Ice

16

Barren or Sparsely Vegetated

17

Water

18

Wooded Tundra

19

Mixed Tundra

20

Barren Tundra

sunzy025

上面的表变成黑色了，好奇怪，但是确实是20个类，与数据所给说明不符啊

weilin421

他似乎分了两类数据 一个是modis20种，还有一个是21种的

weilin421

To introduce a separate land use category for inland water bodies in the
geogrid output, either of the two static land use data sets that are included
in this download may be used. One of these data sets (landuse_30s_with_lakes)
is based on the USGS land use categories, and the other
(modis_landuse_21class_30s) is based on the MODIS land use categories.
The procedure for using these data sets is summarized in the steps below.

他的意思应该是多了lake这类土地利用类型吧所以21种了

weilin421

landmask_water =      modis_15s:17         # Calculate a landmask from this field
        landmask_water =      modis_30s:17         # Calculate a landmask from this field
        landmask_water = modis_30s_lake:17,21      # Calculate a landmask from this field

可以猜测新增的第21类就是上面所说的内陆水体吧。

weilin421

17对应你找的catalog中的water也是能对上的。

sunzy025

weilin421 发表于 2017-11-19 21:46
17对应你找的catalog中的water也是能对上的。

感恩啊！谢谢啦~

sunzy025

答案揭晓：The lake category is identified by the global attribute ISLAKE in the geogrid output files; this attribute should be set to either 28 (in the case of USGS-based data) or 21 (in the case of the MODIS-based data).