# MEGAN BDSNP LANDTYPE Categories **URL:** \ **Category:** MEGAN\ **Created:** [August 22, 2024, 3:55pm UTC](https://forum.cmascenter.org/t/megan-bdsnp-landtype-categories/5164 "2024-08-22T15:55:54Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![gpara35](https://avatars.discourse-cdn.com/v4/letter/g/76d3ee/32.png) [@gpara35](https://forum.cmascenter.org/u/gpara35)\ **Post date:** [August 22, 2024, 3:55pm UTC](https://forum.cmascenter.org/t/megan-bdsnp-landtype-categories/5164/1 "2024-08-22T15:55:55Z")
Hello, MEGAN BDSNP appears to use a land fraction input from WRF to define the land categories used. We’re interested in separating NO from croplands and NO from non-croplands. MEGAN BDSNP from the 2018\_12US1 modeling platform provides a LANTYPE\_CONUS.ncf file described in the CMAQ model inputs to have 24 input soil biomes generated by the MEGAN pre-processor. Which of these would correspond to cropland? WRF can use 24 USGS Land Use categories described [here (page 3 of WRF manual)](https://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3/user_guide_V3.9/users_guide_chap3.html#_Land_Use_and) However, it appears that variable 22 in the LANDTYPE file may correspond to cropland just based on visuals (including corn belt and SJV). Below, I plotted a subset with higher variable numbers. The USGS land use data lists category 22 as mixed tundra. ![image](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/f/ffce1e8b90c8d0e1ed7ff7e348bbe2bfe516e7f6.png) ---
**Author:** ![willison.jeff](https://avatars.discourse-cdn.com/v4/letter/w/c89c15/32.png) [@willison.jeff](https://forum.cmascenter.org/u/willison.jeff)\ **Post date:** [August 22, 2024, 6:30pm UTC](https://forum.cmascenter.org/t/megan-bdsnp-landtype-categories/5164/2 "2024-08-22T18:30:00Z")
This is a little confusing. The 24 land types that inform the biomes in BDSNP are listed in Table 1 here: > **[acp-11-6063-2011.pdf](https://acp.copernicus.org/articles/11/6063/2011/acp-11-6063-2011.pdf)** > > 2.83 MB Not WRF’s land use table.