I did the same thing but with these values
I got these values by using Google Maps and dropping a pin to get the Lat/Lon of the Upper Left and Lower Right (42.454874,-88.59787 and 41.426253,-87.30423) as I saw in your image. Depending on exact you need this to be, you may need to play with the numbers.
Here is the source data I used in the attached workbook:
Lat, Lon, Place 41.877741, -87.635193, Chicago
Once connected, I dragged Lat and Lon up to the Dimension area, and changed them both to Geographic Role -> None from their right-click menus. I put Lon on the Columns shelf and Lat on the Rows shelf. Then using the menu option Data -> Background Images, I linked to your image and entered the above values. I also went the the Options tab and checked the box for Always Show Entire Image. I undisplayed the two axis headers and finally styled the mark.
I hope this helps.
map.twbx 108.2 KB
this is fantastic! It helps a lot.
The point where I am stumbling is the Google Maps part: where you get the bounds for the map image.
I realize that this might not be yet exposed by Tableau, but the bounds should be easily available within it since it displays the map.
>>> I got these values by using Google Maps and dropping a pin to get the Lat/Lon
>>> of the Upper Left and Lower Right (42.454874,-88.59787 and 41.426253,-87.30423) as I saw in your image.
>>> Depending on exact you need this to be, you may need to play with the numbers.
You mention 'dropping a pin': does this mean that you loaded the Illinois image in Google Maps and did the calculations over there. Any tips or a link would greatly help.
many thanks, Adrian
By "dropping a pin" I mean, I went to http://maps.google.com and zoomed into the Chicago area in Map view (it was helpful that you had the roads displayed in your image). I right-clicked and selected "Directions to here" and dragged the pin around till I thought I had it about where the upper left corner of your image was, and dragged it again for the lower right. The left side of the screen displays the lat/lon coordinates.
There may be a better way to do this, but I felt it worked easy enough for a one-off. If you have to do this process for a lot of exported images, I would recommend finding a better way. I have some ideas that I can flesh out if this is what you are looking for, but it would have to fit with your process and goals.
Also, I would recommend exporting to a PNG instead of JPG, as a PNG format does not blur the image.
Thank you so much for sharing.
After trying this out, I would also add:
If the Lat/Lon fields are not Generated, right-click the Lat/Lon fields in the Dimensions/Measures area and select "Set Default"->"Number Format" and set it to "Number (Custom)" with 5 Decimal Places (maybe more, depending on how precise you want to be).
once the point annotation is in place, select it and drag the point of the arrow fully into the corner.
hi i am trying to find a site where i can find western coordinates useing the northern coordinates can u help please thanks n 55d /08m/44s