Thank you for the response Paul, it sounds like I'll be safe as long as I
include the SRS :)
Cheers,
Adam
Sent with [Proton Mail](https://proton.me/) secure email.
------- Original Message -------
On Friday, September 29th, 2023 at 4:20 AM, Paul Harwood <rune...@gmail.com>
wrote:
> As a very general response, you probably need to differentiate between two
> possible questions that you are asking, either:
>
> 1 Does the operation fail with an error, or
> 2 Is the result correct or meaningful?
>
> I don't know about 1). My guess and experience is that, in most cases, it
> won't fail.
>
> However, I would make the case that most operations are undefined if the
> system is making (possibly) unknown assumptions about the CRS. If you are
> asking for the point at a distance along a line or a buffer then you are
> implicitly or explicitly giving the system an input distance, so you are
> making assumptions about the CRS of your input. If your assumptions do not
> match the system's assumptions for the CRS, then the result will be wrong. I
> would say that it is always better to make the definition of the CRS explicit
> and then the result is defined.
>
> On Fri, 29 Sept 2023 at 03:32, adamgutonski via gdal-dev
> <gdal-dev@lists.osgeo.org> wrote:
>
>> Hello,
>>
>> I am using geometry object functions like Buffer and Value. I am wondering
>> if and when it is necessary to assign a spatial reference to an ogr.Geometry
>> before calling these functions? For example if I want to get a point along
>> the line using Value is the output affected by whether or not the ogr line
>> geometry has an assigned spatial reference? Is there a way to tell what
>> geometry functions are affected by this or not?
>>
>> Thanks,
>> Adam Gutonski
>>
>> Sent with [Proton Mail](https://proton.me/) secure email.
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