Hi @Rojee_Byanju
That red thingy is a GEOPSPATIAL MARKER and represents the theoretical the center of the Grid you've assigned to modelspace.
Image-1
In other words, the 'Grid' represents the CENTER of the vertical and horizontal lines in your assigned coordinate system. No, it doesn't represent the 0,0 point or the origin, it's the center the map's Projection.
For example, if I assign Illinois State Plane, NAD83, East Zone, feet, aka EPSG 3534 to my drawing and turn on Bing Map, it would look like this. The geospatial marker is the middle of the coordinate system's grid projection and the dark area in the upper right of the aerial is Lake Michigan.
Image-2
If I zoom-in tight, really really close, I'll be able to see something like this: Wrigley Field, home of the Cubs.
Image-3
And......if I go to Geolocation tab=>Online Map Panel=>Mark Position Dropdown=>Point, I can insert a GEOMARKER on second base. FYI, the Geomarker is useful if I want to display BOTH the Lat/Long degrees and the X,Y coordinates in Feet, simultaneously.
<<As long as my drawing has a PROPERLY ASSIGNED A COORDINATE SYSTEM, I can determine a point's Lat/Long coordinates in degrees. This is TRUE even though I've assigned a coordinated system of Illinois State Plane, NAD83, East Zone, feet.>>
Despite my drawing units of FEET, the Geomarker is capable of displaying geospatial Lat/Long position in DEGREES and X,Y position in FEET. You can verify Wrigley Field's second base Lat/Long position by adding a pushpin to Google Earth Pro (Lat/Long highlighted Green) to see whether if it lands on second base.
Image-4
If you can't SEE your image in your viewport, it's likely you didn't PROPERLY assign a coordinate system. (BTW, it should be a Bing image, not 'Gooogle Map' image, unless you're using 3RD party software to bring Google's imagery).
You can easily perform the TEST below to see whether your drawing is properly georeferenced.
- Open a brand new, clean drawing.
- Assign your coordinate system. Do NOT add, draw, or create any linework! Keep this drawing clean. Zoom-OUT until you see the red Geospatial marker. If you don't assign a projected coordinate system then you won't be able to turn on Bing Aerial imagery. Do not skip step 2.
- Go to Geolocation Tab=>Online Map Panel=> Change Map OFF to Bing Hybrid and wait for the Bing logo to appear in lower right corner of modelspace. The logo means you are connected to Bing's Server.
- Zoom-IN on Bing imagery. Use AutoCAD's Pan and Zoom commands and navigate to your site using Bing labels as your guide. (You may draw a circle that roughly surrounds your site if you wish.)
- From your original drawing, perform Copy-and Paste. COPY all objects from your original drawing to the clipboard making sure to use 0,0 as the basepoint. Go to your NEW drawing and PASTE the contents of your clipboard--be sure to paste to 0,0.
If your pasted linework is consistent with Bing imagery, then your original drawing is properly georeferenced. If your linework lands far away from the correct Bing imagery location, then there are two possibilities. Which possibility is correct is unknown unless you upload your original drawing for diagnosis. Possibilities are:
- Your original drawing was NOT georeferenced properly (or not georeferenced at all).
- You didn't assign the correct coordinate system in step 2 above and you need to replace it with another one.
Chicagolooper
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