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Subject:
Slope of a block in Nob Hill, San Francisco, CA
Category: Miscellaneous Asked by: rbnn-ga List Price: $10.00 |
Posted:
17 Jul 2005 00:12 PDT
Expires: 16 Aug 2005 00:12 PDT Question ID: 544421 |
What is the slope of California Street between Grant and Stockton in San Francisco, CA? |
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Subject:
Re: Slope of a block in Nob Hill, San Francisco, CA
Answered By: tutuzdad-ga on 19 Jul 2005 09:36 PDT Rated: |
Dear rbnn-ga; Thank you for allowing me to answer your interesting question. According to the Bureau of Street Use and Mapping, a division of the City and County of San Francisco Department of Public Works, the street grade (slope) of this portion of California Street between Grant Avenue and Stockton Street is precisely 18.18%. City of San Francisco Bureau of Street Use and Mapping http://www.sfgov.org/site/sfdpw_index.asp?id=31968 I hope you find that my answer exceeds your expectations. If you have any questions about my research please post a clarification request prior to rating the answer. Otherwise I welcome your rating and your final comments and I look forward to working with you again in the near future. Thank you for bringing your question to us. Best regards; Tutuzdad-ga ? Google Answers Researcher INFORMATION SOURCES City of San Francisco Bureau of Street Use and Mapping 875 Stevenson Street, Room 460 San Francisco, CA 94103 Phone (415) 554-5810 SEARCH STRATEGY Called City of San Francisco Bureau of Street Use and Mapping and made personal inquiries. SEARCH ENGINE USED: Google ://www.google.com Terms: Bureau of Street Use and Mapping | |
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rbnn-ga
rated this answer:
and gave an additional tip of:
$3.00
Very helpful and researcher found a great source. I would have preferred a bit more detail on the research process (the name of person spoken to; the time and duration of call) as well as a bit more on variability or lack thereof of the slope throughout the extent in question. Also great comments. |
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Subject:
Re: Slope of a block in Nob Hill, San Francisco, CA
From: borisshah-ga on 17 Jul 2005 06:24 PDT |
Hi There. Would you like to know the gradient or the answer in degrees. Could you please be more specific |
Subject:
Re: Slope of a block in Nob Hill, San Francisco, CA
From: myoarin-ga on 17 Jul 2005 06:31 PDT |
As I reckon it from this map, that block of California St is 525 ft long and rises approx. 75 ft. By my calculation that would be a slope of 14.3 % http://www.topozone.com/map.asp?lat=37.7954&lon=-122.4019&size=s&symshow=n&datum=nad83&layer=DRG25 OK? Myoarin |
Subject:
Re: Slope of a block in Nob Hill, San Francisco, CA
From: rbnn-ga on 17 Jul 2005 08:25 PDT |
As to borisshah-ga's comment, the two measures are equivalent via arc-tangent. As to myoarin-ga's comment, I am a bit skeptical of the accuracy or precision of this map, at least as applied to such small distances. For example the map shows the lower part of the block being about half as steep as the middle part, which is not what I recall. Is there a map at a finer scale, or information on the accuracy of this map? |
Subject:
Re: Slope of a block in Nob Hill, San Francisco, CA
From: myoarin-ga on 18 Jul 2005 06:16 PDT |
Rbnn-ga, I can't argue with you on that, but wouldn't we have to believe something published by the US Govt? (Don't answer that!) Google Earth has a topographical feature, but my software doesn't accept it. And I don't know it is more accurate. This site - once you get into it - seems to have the same topo-lines. http://sunsite2.berkeley.edu:8088/xdlib//maps/brk00010.00000005.xml I could not get to a map on the following one, but maybe you can. http://gcmd.nasa.gov/records/SFB-Badger.html This is a great map collection source, but I did not pursue it: http://lii.org/search?searchtype=subject;query=Maps;subsearch=Maps I wonder if all the modern topo maps have the same USGD source. I could also imagine that slope of the streets has been straightened over the years, something which has not been captured on the maps. Good luck, Myoarin |
Subject:
Re: Slope of a block in Nob Hill, San Francisco, CA
From: myoarin-ga on 19 Jul 2005 13:43 PDT |
Yeah, that answer makes sense to me on the logic that my very rough estimate of the distance between Grant Ave. and Stockton was too long, especially considering that the slope of California St. is increased by the fact that the sloping portion is even shorter, starting to drop a bit after the intersection at Stockton and leveling off before the one at Grant. I have to wonder a little at the Bureau's precision to the second decimal place. If the distance between grant and Stockton is 425 ft, at a slope of 18.18% California rises 77.265 ft; at a slope of 18.2%, it would rise 77.350 ft., just about one inch more. Pretty fine measuring. |
Subject:
Re: Slope of a block in Nob Hill, San Francisco, CA
From: myoarin-ga on 22 Jul 2005 03:36 PDT |
Rbnn-ga, I agree entirely with your recollection and the information from Tutuzdad-ga and the City that the sloping portion is now pretty much a straight line, regardless of how the topography once was. (Actually, I was pretty pleased with my calculation, although it was proved wrong. I should have envisioned the street terrain instead of just staring at the topo map and could have recognized that slope would be greater. Try me on Market St.) Myoarin |
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