10.2. Working with ABI Level 2 Cloud Product Files¶
This example walks through the creation of GOES ABI Level 2 GeoTIFF product image files and adding overlays.
10.2.1. The Basics of Geo2Grid ABI L2 GeoTIFF File Creation¶
Find the options available when creating GOES-16, -17 and -18 ABI Level 2 GeoTIFFs:
geo2grid.sh -r abi_l2_nc -w geotiff -h
List the products that can be created from your ABI dataset:
geo2grid.sh -r abi_l2_nc -w geotiff --list-products -f <path_to_files>
Geo2Grid now supports two different ABI Cloud Products, cloud top
height (HT) and cloud top temperature (TEMP). The height files use product
names ACHA
while the temp files using ACHT
. For instance
CG_ABI-L2-ACHAC-M6_G17_s20223271831172_e20223271833556_c20223271834370.nc
CG_ABI-L2-ACHTC-M6_G17_s20223271831172_e20223271833556_c20223271834370.nc
You can provide Geo2Grid with both files for the same date/time and it will provide you the option to create both products with one execution.
To create GeoTIFF output files of both products found in this data set,
geo2grid.sh -r abi_l2_nc -w geotiff --num-workers 8 -f <path_to_files>
By default the products are color enhanced using the colormap:
$GEO2GRID_HOME/colormaps/abi_l2_modified_cloud_top.cmap
.
Create just a Cloud Top Height Geotiff image:
geo2grid.sh -r abi_l2_nc -w geotiff -p HT -f <path_to_abi_files>
Create a Cloud Top Temperature image from the GOES-17 CONUS domain product created from 23 November 2022, 18:31 UTC ABI observations.
geo2grid.sh -r abi_l2_nc -w geotiff -p TEMP -f CG_ABI-L2-ACHTC-M6_G17_s20223271831172_e20223271833556_c20223271834370.nc
The resulting image is displayed below.
Add a color table, coastlines, borders and latitude/longitude grid lines to the image, and write the output
to the file my_goes17_abi_ctt.png
using the add_coastlines.sh
script. The script provides many options,
including the ability to add a colorbar title using the font of your choice (provide the path
to the font location on your local machine):
add_coastlines.sh GOES-17_ABI_TEMP_20221123_183117_GOES-West.tif --add-colorbar --colorbar-text-color="black" --colorbar-title="GOES-17 ABI Cloud Top Temperature (°K) 23 November 2022 18:30 UTC" --add-coastlines --coastlines-outline "black" --coastlines-level 1 --coastlines-resolution=i --add-borders --borders-level 2 --borders-outline gray --coastlines-width 2 --colorbar-tick-marks 10 --colorbar-font /usr/share/fonts/gnu-free/FreeSerifBold.ttf -o my_goes17_abi_ctt.png
Users can aslo overlay Level 2 images onto other GeoTIFFS. In the example execution below, we overaly the Cloud Top Temperature GeoTIFF image on top of the GOES-17 true color image from the same time and name the output GeoTIFF “goes17_overlay_true_color_cloud_temperature.tif”.
overlay.sh GOES-17_ABI_RadC_true_color_20221123_183117_GOES-West.tif GOES-17_ABI_TEMP_20221123_183117_GOES-West.tif goes17_overlay_true_color_cloud_temperature.tif
The new combined GeoTIFF is displayed below.