Inquiry
I'm currently exploring some of the City of New York's landmark data and wanted to make sure that I am correctly interpreting the data from this web page: https://data.cityofnewyork.us/Recreation/Individual-Landmarks/ch5p-r223.
Ultimately, my goal is to compile and analyze data on all active landmarks.
Can you please answer the following questions?
1. Is it correct to assume that the unique identifier for each officially designated landmark is its LP Number? By way of example, "Central Park" has more than 100 entries, all of which have LP-00851. Is it then correct to assume that all of these entries are simply objects or properties that together comprise a single landmark, which is Central Park/LP-00851?
2. Assuming that the LP number refers to the overall landmark, is the "Object ID" field the unique identifier that is used to determine the number of items that together comprise that landmark?
3. Putting together the above assumptions, if one seeks to identify the current number of total landmarked objects, is it best to sort for "Most Current = 1," and for "Status=Designated"?
3.a. By way of example, in the case of Central Park, if one sorts only for "Most Current=1" and "Status=Designated", it suggests that Central Park is 1 Landmark (based on its 1 unique LP #) that is comprised of 102 Objects. Is this correct?
3.b. Similarly, if one looks at the entire dataset, and sorts it only for Most Current=1 and Status=Designated, one is left with 1,669 landmarks and 36,877 objects. Understanding that some new landmarks may have changed since this data was uploaded, is this interpretation correct?
3.c. If the above is not correct, what is the best way to think about analyzing the number of official landmarks and the number of objects/properties that are included within broader landmarks?
Assigned Agencys Response
Greetings,
1. Is it correct to assume that the unique identifier for each officially designated landmark is its LP Number? By way of example, "Central Park" has more than 100 entries, all of which have LP-00851. Is it then correct to assume that all of these entries are simply objects or properties that together comprise a single landmark, which is Central Park/LP-00851?
Answer: Yes, it is correct to assume that the unique ID for each designated landmark is its LP number and that all of the points are elements that make up one designation.
2. Assuming that the LP number refers to the overall landmark, is the "Object ID" field the unique identifier that is used to determine the number of items that together comprise that landmark?
Answer: Yes, and that would give the total number of ‘buildings and sites’ that make up a designated landmark.
3. Putting together the above assumptions, if one seeks to identify the current number of total landmarked objects, is it best to sort for "Most Current = 1," and for "Status=Designated".
Answer: In addition to Most_Current = 1 and Status = Designated you’ll also want to sort Last_Action = Designated.
3a. By way of example, in the case of Central Park, if one sorts only for "Most Current=1" and "Status=Designated", it suggests that Central Park is 1 Landmark (based on its 1 unique LP #) that is comprised of 102 Objects. Is this correct?
Answer: Yes, 102 ‘buildings and sites’ that make up the Central Park designation.
3b. Similarly, if one looks at the entire dataset, and sorts it only for Most Current=1 and Status=Designated, one is left with 1,669 landmarks and 36,877 objects. Understanding that some new landmarks may have changed since this data was uploaded, is this interpretation correct?
Answer: Yes, that sounds correct for the time period in which the data was last updated. The official count for designated landmarks as it stands today is 1672 made up of 36,982 buildings and sites. We’ll be uploading an updated version of all of our shapefiles in the very near future.
- Landmarks Preservation Commission (LPC)
- NYC Open Data