There is a global latitude and longitude grid data available at 1 degree resolution and higher (http://www.arcgis.com/home/item.html?id=f11bcdc5d484400fa926dcce68de3df7). Is anyone aware of a finer resolution dataset (at 0.25 and 0.5 degree)? Or alternatively a way to make it in ArcGIS/GDAL/Python using the 1 degree product?
As @Dan Patterson says Create Fishnet is the ArcGIS way to go - and, at least at 10.1, it seems to be available at all license levels.
You can create 1 degree or 30 minute grids in the ArcGIS Data Frame Properties, as follows:
- Right click your Data Frame in the TOC > Properties > Grids
- Select New Grid
- In the second window of the Grid and Graticule wizard, choose 1 degree for both the parallel and meridian sections. Alternatively, choose 30 minutes (i.e. for 0.5 degree).
You can also convert your grid to graphics within the Dataframe Properties > Grids window.
The "USGS Map Indices Downloadable Data Collection" hosts a wide variety of resolutions of lat/long grids. As stated on their data download page:
This data consists of data grids for the entire United States area, including 1 X 2 Degree, 1 X 1 Degree, 30 X 60 Minute, 15 X 15 Minute, 7.5 X 7.5 Minute, and 3.75 X 3.75 Minute. The grid was generated using ESRI ArcInfo GIS software.
The USGS offers downloads in a variety of formats, but the most ubiquitous is the ESRI Shapefile (grouped by state).
You can also view these datasets through an USGS hosted ArcGIS REST Web Service.