# How do I interpret this proj4string and why doesn't changing units change its resuls? [closed]

I'm new to GIS - I have a background in statistics. I have the following proj4string:

``````'+proj=lcc +lat_1=40.66666666666666 +lat_2=41.03333333333333 +lat_0=40.16666666666666 +lon_0=-74 +x_0=300000 +y_0=0 +datum=NAD83 +units=us-ft +no_defs +ellps=GRS80 +towgs84=0,0,0'
``````

Can someone explain:

1. What the parameters mean (I think lcc means 'lambert conic conformal')
2. Where I should go to learn how this works/what projections are available?
3. The input lat, lon coordinates are in decimal degrees. What are the output units? The +units=us-ft suggests feet
4. I want to focus my analyses on Manhattan, Brooklyn, Queens, the Bronx. As part of my analysis, I want to split my projected map into a grid. Ideally, each cell will be, say, 1/10th a mile square. What projection should I use for this sort of work? Is LCC acceptable?

## closed as too broad by Midavalo♦Feb 13 '17 at 17:20

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• LCC is Lambert Conformal Conic, but close enough ;) – Erica Mar 19 '15 at 18:01
• Answer on question #2 (where to find information on proj4strings): You may find some useful info here: proj4.org – Jelmer Feb 13 '17 at 16:42

For coordinates, use `cs2cs`, for vector data `ogr2ogr`, and for raster data `gdalwarp`.