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Imported Image a rhombus
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* July 23, 2015, 03:03:06 PM
When I insert an image to create an underlay the image is distorted to the shape of a rhombus. The Sides seem to be snapping to the grid. I have tried to import as a jpg and pdf, and the problem persists! Whereas I going wrong, surely I can just import an image, click on keep scale and scale to the desired size.

Part two of my query, if i have an image of an aerial photo of a house and its boundaries, and I know one boundary is say 120 metres long, can I scale the image by defining two points on the image and resizing it?

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* July 23, 2015, 03:28:18 PM
#1
Part 1
Turn off the snap and test

Part 2
Yes, but if you know the area of the land/ plot, use square root to get the most exact scalefactor
( Draw a closed polyline around the plot and get the area in Selection Info palette to use for divide with what it actually is )

Torfinn

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V18, V19, V20, V21, 2015/ 16/ 17/ 18 Pro. Platinum
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NVIDIA Geforce GTX 780m, 1 GB


* July 27, 2015, 09:12:24 PM
#2
thank you, and apologies, I am still having an issues getting this to work.
Could you post a link to a tutorial which covers this, or provide details?

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* July 28, 2015, 12:28:42 AM
#3
If you know the plot area and have draw a polyline that follow the borders, select the polyline and get the area from Selection Info Palette/ Metric.
In Attached 1, it's 3,544362 m2
I know the plot is 674,5 m2
so then i get the scalefactor by sqrt (674,5) / sqrt (3,544362) = 13,795007506643321585545847737614

Select the underlay and the polyline and paste the number 13,795007506643321585545847737614 in to scale X and Y field and hit enter, and you will se that the Selection Info now telling it's 674.499961 m2

Torfinn

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V18, V19, V20, V21, 2015/ 16/ 17/ 18 Pro. Platinum
Deluxe V20, V21, 2015/ 16/ 17
RedSDK enabled
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB


* July 28, 2015, 07:55:36 AM
#4
When I insert an image to create an underlay the image is distorted to the shape of a rhombus. The Sides seem to be snapping to the grid. I have tried to import as a jpg and pdf, and the problem persists! Whereas I going wrong, surely I can just import an image, click on keep scale and scale to the desired size.

Part two of my query, if i have an image of an aerial photo of a house and its boundaries, and I know one boundary is say 120 metres long, can I scale the image by defining two points on the image and resizing it?

Yes, easily -- if you've fixed the "rhombus" problem. Assuming that the boundary is straight, draw a line between its two endpoints, select the line, and read its Length in the Selection Info palette. Comparing that length with the known length of the boundary will tell you the current scale of the image, and from that you can determine the factor by which it must be enlarged or reduced to make it the desired scale. Select the image; TAB to the Scale X field of the Inspector Bar and type that factor; TAB to the Scale Y field and type that factor; press Enter. The image will rescale itself. Draw a new line along the boundary and verify that the rescaling was done correctly.

Henry H

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* July 28, 2015, 09:50:50 AM
#5
When I insert an image to create an underlay the image is distorted to the shape of a rhombus. The Sides seem to be snapping to the grid. I have tried to import as a jpg and pdf, and the problem persists! Whereas I going wrong, surely I can just import an image, click on keep scale and scale to the desired size.

Part two of my query, if i have an image of an aerial photo of a house and its boundaries, and I know one boundary is say 120 metres long, can I scale the image by defining two points on the image and resizing it?

Can you attach the PDF file to this post?

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DonCW

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