Timeline for Determine exact coordinates for a map image?
Current License: CC BY-SA 3.0
18 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 19, 2015 at 3:26 | comment | added | David K | Working with existing images, the image itself provides a bounding box, though usually not a minimal one. You might be able to do some kind of "smart crop" (maybe even before putting the images in your database) to make the bounding box tighter. | |
| Feb 18, 2015 at 23:10 | comment | added | marczellm | @DavidK I have no better idea than using existing images, like the one in the question. Step 2 is implemented in JS and canvas. | |
| Feb 18, 2015 at 22:37 | comment | added | David K | How do you propose to draw the map? That will tell a lot about what you know about the coordinates of the map and how you would construct a bounding box. It depends very much on what kind of data you have to start with. | |
| Feb 18, 2015 at 20:12 | answer | added | Jay Elston | timeline score: 2 | |
| Jan 23, 2015 at 2:01 | history | reopened | CommunityBot | ||
| Jan 23, 2015 at 0:09 | comment | added | James McLeod | Maybe this is a candidate for migration to gis.stackexchange.com? Look into postgis.net - with a little difficulty, you can set up a map tile server and use existing browser-side tools do display them and to convert from browser window coordinates to map coordinates. | |
| Jan 22, 2015 at 23:45 | history | edited | MetaFight | CC BY-SA 3.0 | deleted 1127 characters in body |
| Jan 22, 2015 at 23:42 | comment | added | MetaFight | This is a great re-write. This is not my area of expertise, though, so I can't tell if adequate answers would be too large for this Q&A format. | |
| Jan 22, 2015 at 13:45 | comment | added | user53019 | @kdgregory Pretty certain I went with too broad because of "good answers would be too long for this format." Most close voters will use too broad for questions like the original version which was essentially a "where do I start?" type question. | |
| Jan 22, 2015 at 13:01 | review | Reopen votes | |||
| Jan 23, 2015 at 2:06 | |||||
| Jan 22, 2015 at 12:42 | history | edited | marczellm | CC BY-SA 3.0 | complete rewrite |
| Jan 21, 2015 at 16:29 | comment | added | kdgregory | I don't know why the closers chose "too broad," but in my opinion the question remains unclear. Even with your edit, I still don't know whether you're trying to place markers on an image that contains a blank map or something else. Your comment about knowing the lat/lon for an image is particularly strange: if you create the image, you should already know what it represents. I suggest a complete rewrite of the question, in which you paste pictures and description of what you want to do at each step. Also be very clear about what you already have and what you want to achieve. | |
| Jan 21, 2015 at 11:13 | comment | added | marczellm | Please explain how my question is too broad. | |
| Jan 19, 2015 at 1:00 | history | closed | Dan Pichelman CommunityBot Bart van Ingen Schenau | Needs more focus | |
| Jan 18, 2015 at 14:52 | history | edited | marczellm | CC BY-SA 3.0 | added 177 characters in body |
| Jan 18, 2015 at 13:28 | comment | added | kdgregory | It's unclear what you're asking. If you want to plot lat/lon on a flat plane, then yes, projection is important. The standard "schoolroom" projection is Mercator, and the Wikipedia article gives you all the math you need. | |
| Jan 17, 2015 at 21:01 | review | Close votes | |||
| Jan 19, 2015 at 1:04 | |||||
| Jan 17, 2015 at 14:09 | history | asked | marczellm | CC BY-SA 3.0 |