Changeset: 142459827
Realign VTA Guadalupe Yard and areas surrounding, add detail to various ways and shapes, add missing roadways
Closed by Moonfire
Tags
created_by | JOSM/1.5 (18822 en) |
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source | Mapbox Satellite; Bing |
Discussion
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Comment from impiaaa
What did you align to? Buildings were imported from the city and are assumed to have accurate alignment. Otherwise they'd be offset from the rest of the city. Why did you remove so much landuse? Why did you tag the area surrounding the parking garage as a parking lot?
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Comment from Moonfire
I took the position of NOAA NGS mark AA1872 that is next to the driveway of the property just south of the intersection of West Younger Avenue and North San Pedro Street, used NOAA's Vertical Datum Transformation tool to convert it's reported coordinates from the NAD83(2011)/NAVD88 datum to the reference frame OSM currently uses, WGS84(G1674)/EGM96, as well as adjusting from epoch 2010.0 when the measurement was performed to epoch 2023.0 to account for the continental drift that has occurred in the interim. I then used the satellite image offset feature in JOSM to align the images carefully with the position of the survey mark. For this project, I used Bing for the more current imagery reflecting recent construction and also that it is coincidentally nearly directly overhead, reducing building shape distortion, and Mapbox for the higher image clarity offered for some features. I also used Google Street View in some areas to supplement some observations where things may be visually vague or obscured. As the NGS mark I used for alignment is not easy to spot in satellite imagery currently available, I used a second mark (AA1873) with a more readily visible position to verify my work using the same coordinate source and transformation process, this one in the gravel lot at the intersection of Wildwood Avenue and Mission College Boulevard. When zoomed in tightly on the current Bing imagery at this location, you may see a roughly circular feature of slightly lighter color than the surrounding material due to the higher reflectivity of the metal cover for the survey mark. In this case, the image was offset by a relatively small amount from stock, about 30 cm. It is common for imagery to have incorrect offsets by as much as a meter, so this sort of fine adjustment can be very helpful. You may also find that city-provided information may vary quite a lot from reality in location, size, shape, and orientation, and that's before we even account for new construction. Some of this is due to continental drift, and some due to low resolution, simplified, or inaccurate data.
Regarding the land use, a majority of the area covered was one large contiguous land use tagged industrial, which was incorrect for most of it. I do intend a second pass over this area to add additional detail including adding back some land use areas with better granularity, such as the parking area for VTA employees at the far end of the rail yard.
As for the parking garage, I overlooked that the garage itself already had a parking amenity tag. As the land use around it would have no other values, I will remove the land use shape.
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Relations (11)
- Blue Line: Baypointe => Santa Teresa (2989876), v48
- Green Line: Winchester => Old Ironsides (2989877), v61
- VTA 61: Good Samaritan Hospital => Union & Lantz => Berryessa BART (5324611), v86
- VTA 61: Good Samaritan Hospital => Bascom & Camden => Berryessa BART => Sierra & Piedmont (5324612), v100
- 5327555, v5
- West San Carlos - First Street (6205381), v9
- 7527468, v2
- North 1st Street (9254462), v35
- VTA 181: Warm Springs BART => San Jose Diridon (9896081), v34
- Green Line: Old Ironsides => Winchester (9897506), v20
- Blue Line: Santa Teresa => Baypointe (9897507), v10
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