Summary of the Article:

### Surface Data Required for the Community Land Model (CLM)

The article provides an overview of the surface data required for the Community Land Model (CLM), a key component of Earth system models. The main points are:

**Required Surface Data:**
- Glacier, lake, and urban fractions of each land grid cell
- Fractional cover of each plant functional type (PFT)
- Monthly leaf and stem area index, and canopy height for each PFT
- Soil properties (color, texture, organic matter density)
- Maximum fractional saturated area, slope, and elevation
- Biogenic volatile organic compound emission factors
- Population density, gross domestic product, peat area fraction, and peak month of agricultural burning

**Data Sources and Processing:**
- Glacier and ice sheet data derived from global inventories and satellite data
- Lake and urban data from high-resolution datasets
- PFT fractions, leaf/stem area index, and canopy heights from satellite observations
- Soil properties from global datasets
- Maximum saturated area, slope, and elevation from topographic data
- Other datasets compiled from various sources

**Cropland Representation:**
- Unmanaged and managed crop PFTs are represented
- Irrigation is implemented for the C3 generic crop type
- Irrigated and unirrigated croplands are treated as separate land units

The article provides comprehensive details on the surface data required for CLM, its spatial resolution, and the sources and processing of the input datasets.