[Gvsig_english] BUG: gvSIG 1.9 (Build 1253) Image Filtering
Benjamin Ducke
benjamin.ducke at oxfordarch.co.uk
Thu Dec 17 12:58:41 CET 2009
And here comes the artillery:
Coordinate (reference) system (CRS) = a mathematical convention for describing locations relative
to a defined origin (e.g. Cartesian: 100m East, 200m North, Geographic: lat and long).
Datum = a precise description of the origin of a geodetic system, nowadays this often includes
a mathematical transformation type and its parameters to convert measurements from
a foreign system into the system for which the datum is defined (e.g. Potsdam datum).
Projection = a mathematical formula and its parameters that allows you to literally
project "natural" locations on the Earth's curved 3D surface to a plane for display on
e.g. a 2D map or monitor. An approximation model of Earth's geoid shape ("Ellipse") is
also needed for this to work.
Spatial reference system (SRS) or geodetic reference system: the whole bunch of those
components together. This is what a GIS menu entry usually refers to, even if it is
labelled "projection".
... never mind what the GUIs tell you!
Ben
----- Original Message -----
From: "Simon Cropper (Botanicus Australia Pty Ltd)" <scropper at botanicusaustralia.com.au>
To: "Users and Developers mailing list" <gvsig_internacional at listserv.gva.es>
Sent: Thursday, December 17, 2009 12:49:06 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Gvsig_english] BUG: gvSIG 1.9 (Build 1253) Image Filtering
Ben & Sergio,
Thanks for your understanding. Feel a bit stupid now I look at the
dialog box. Pretty obvious when you have your head in gear.
Ben. I'll bite. Enlighten me on the distinction between projection &
coordinate system.
OK, here I go again, potentially making myself look stupid...
coordinate system = northing-easting, lat-long (MGA55, AMG53)
datum = framework used to reference the coordinate system (GDA94, AGD66)
projection = particular datum-coordinate system combo (e.g. GDA94 MGA55,
GDA94 lat/long, AGD66 AMG53, etc)
Should I duck for cover?
Cheers Simon
Simon Cropper
Botanicus Australia Pty Ltd
PO Box 160, Sunshine, Victoria 3020.
P: 9311 5822. M: 041 830 3437.
mailto: scropper at botanicusaustralia.com.au
<mailto:scropper at botanicusaustralia.com.au>
web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>
Benjamin Ducke wrote:
> It's OK Simon, we forgive you now ;)
>
> The problem with GIS is that the user interfaces are often designed
> by people who are not actually cartographers or geoscientists.
> Let's not even get started about the way the terms "projection"
> or "coordinate system" are used in GIS...
>
> Ben
>
> ----- Original Message -----
> From: "Simon Cropper (Botanicus Australia Pty Ltd)" <scropper at botanicusaustralia.com.au>
> To: "Users and Developers mailing list" <gvsig_internacional at listserv.gva.es>
> Sent: Thursday, December 17, 2009 12:16:47 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
> Subject: Re: [Gvsig_english] BUG: gvSIG 1.9 (Build 1253) Image Filtering
>
> Ben,
>
> I agree. In cartographic terms it is correct. It should stay that way,
> but as you stated other packages don't express these ranges correctly
> and newbies to gvSIG, like myself, misunderstand the dialog box and post
> a thread. Some sort of reminder or warning right next to the input box
> would be a timely reminder.
>
> Cheers Simon
>
> Simon Cropper
> Botanicus Australia Pty Ltd
> PO Box 160, Sunshine, Victoria 3020.
> P: 9311 5822. M: 041 830 3437.
> mailto: scropper at botanicusaustralia.com.au
> <mailto:scropper at botanicusaustralia.com.au>
> web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>
>
>
>
> Benjamin Ducke wrote:
>
>> Please keep it that way. It's perfectly correct in cartographic
>> terms. The fact that all other GIS have taught their users wrong
>> terminology does not change that.
>>
>> Ben
>>
>> ----- Original Message -----
>> From: "Sergio Clark" <sergio.clark at iver.es>
>> To: "Users and Developers mailing list" <gvsig_internacional at listserv.gva.es>
>> Sent: Thursday, December 17, 2009 9:58:23 AM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
>> Subject: Re: [Gvsig_english] BUG: gvSIG 1.9 (Build 1253) Image Filtering
>>
>> Hi,
>>
>> I don't think this is a bug. Now both raster and vector layers work the
>> same way regarding the scale range of visualization (we homogenized the
>> text in both pannels inside 'Properties').
>>
>> I mean, "Don't show layer when the scale is greater than 1:100" means
>> that it won't be displayed when scale is 1:99, because second one is
>> "greater scale" than first one (minor denominator, but major scale). And
>> it's the same for "less than...".
>>
>> Regards,
>> Sergio.
>>
>>
>>
>> Sergio Clark
>> Equipo gvSIG
>> IVER T.I., S.A.
>> www.iver.es
>> www.gvsig.com
>>
>>
>>
>> Rahkonen Jukka escribió:
>>
>>
>>> Hi,
>>>
>>> Maybe this is the old question about which scale is big and which is
>>> small? Compare scales 1:10 and 1:100. Hundred is bigger number than ten,
>>> but because it appears in the denominator the scale 1:100 is smaller
>>> than 1:10.
>>>
>>> Perhaps it would be more clear to put the words in another way: "Do not
>>> show this layer if scale denominator is bigger/smaller than".
>>>
>>> -Jukka Rahkonen-
>>>
>>> Simon Cropper wrote:
>>>
>>>
>>>
>>>
>>>> Hi Guys,
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>> I have Noted a bug in the program.
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>> If you set the scale range for a raster file the "is above 1:????" and
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>> "is below 1:????" is around the wrong way.
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>> If you set "Do not show this layer if the scale is above 1:100000",
>>>>
>>>>
>>>>
>>> the
>>>
>>>
>>>
>>>> image only appears if the scale exceeds 1:100,000.
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>> So either the text is wrong or the filter condition is around the
>>>>
>>>>
>>>>
>>> wrong way.
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>>>
>>>
>>>
>>>
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>>
>>
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