You have to learn the API and how to format your data for input, but it can be done in batch and not one at a time. You've already found some tools that will do it one point at a time, but I believe some of them are also services (such as the BLM link in my comment on Dana's post). You'll also end up with multiple points in the same location, since anything in the same qq will have the same coordinate.Īlternatively you would have to find a service out there that can do this lookup for you. But there's no single source for the entire system, and not all sources go past the section level. For many, but not all, areas covered by the PLSS, you can download a grid dataset to generate centroids and then coordinates from. From looking at your data, you would need to do this at the QQ (quarter-quarter) level. One you had this table with every qq's centroid by name/reference in one column and the lat/lon for it in another (or others), you can join or add those coordinates to your data and then plot them.Īs you've seen, it is possible to find the lat/lon of the corners/centroid for a given grid reference. The example you posted doesn't give any method of identifying which baseline/meridian to use, and if you're covering such a large area you will most certainly run into more than one of them. In other words, there is more than one Township 1 North, Range 1 West. Township and range are specified from reference baselines and meridians. At a minimum this would be the township-range-section-qq, but there's an added complication. Your lookup table would need to have a common field with your data (which may require modifying said data). To automate this, you would need to generate (or find - I don't know if one is out there) a coordinate lookup table for a script to reference or to use in a join. The PLSS is a reference grid, not a coordinate system (and note that it doesn't cover the entire US). There is no formula/equation to convert from the PLSS to lat/lon. I tried to search online but couldn't find any information regarding this except online tools where we put information for each point manually.įirst few lines of my data: Township Range1 Section QQ Footages I found this online tool which gives latitude and longitude of centroid and four corners of the section, but I want to do the same thing using R or Python. What kind of equations they use to convert it into latitude and longitude? Is there any way i can write R or python scripts to batch convert all the points to latitude and longitude? I have 300,000 data points from all over the USA. I have data in the form of Section, Township, Range and meridian.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
May 2023
Categories |