One bug, a suggestion, two questions, and an offer

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One bug, a suggestion, two questions, and an offer

Guy Burns-2
Hi,

I'm completely new to this Grass stuff and have been trying out QGIS  
on my G5 iSight under OSX 10.4.8. One bug which almost made me go no  
further than a few minutes with it (after playing around with Arc  
Explorer for a while) was: I could not open or close LAYERS by  
ticking in the tick box.

BUG
This is the problem: the area where a click is detected when trying  
to open and close LAYERS is not centred on the box itself. It appears  
to be slightly to the left. ie if I click in the centre of the box,  
nothing happens. I have to click in the top left hand corner of each  
of the LAYER tick-boxes to get any action.

Here's why I want to use QGIS. I am putting together a book about  
western Queenland. In the opening chapters I tell a few stories about  
the early explorers. They went from river to river (or more  
accurately, from waterhole to waterhole on these rivers) and I want  
to be able to show their routes on very simple uncluttered maps.  
Let's say there are 10 rivers of interest: R1, R2, R3, R4... One of  
my maps might have only R1, R5, R6 on it; another R9 and R10;  
another, R5, R8, R9 and so on. So I thought I would generate a master  
map with only these 10 rivers on it, and each on a separate layer. To  
make the different maps, I just select whichever rivers I want to  
show (plus the explorer's route). Sounds simple, but after spending  
all day on it yesterday I have discovered a few limitations of QGIS.

When I try to generate a layer with only R2 on it, by:

* selecting a layer (call it L1) that has every watercourse in  
Australia on it, then
* selecting the river I want, then
* copying and pasting it on to a new layer (call it L2) which will be  
just for R2,

it works OK except for one slight hitch. When I set up a NEW VECTOR  
LAYER for L2, one of the steps ask me to set up the ATTRIBUTES. I  
found through trial and error, that if I didn't have the same number  
of NAMES and TYPE for L2 as for L1 (the layer with all the rivers on  
it),  QGIS crashed when I tried to paste R2 onto L2. To explain it a  
different way: when I go to LAYER PROPERTIES>METADATA for L1, I see a  
list like this (Field: Type, Length):

ID:   Real, 11
F_CODE:   String, 5
F_CODE_DES:   String, 254
HYC:   Integer, 6
NAM:, String, 254...

However, when I set up the attributes of L2 to look the same as those  
of L1, the lengths that are automatically assigned by QGIS to each  
field are not the same as those assigned to L1. The result: the river  
R2 appears OK on the map, but the attributes are all mixed up. ie  
what should have been in the NAM field might be under HYC.

SUGGESTION: when setting up a NEW VECTOR LAYER, an option should be  
made available to COPY the attributes of another layer.


Now I have two questions:

Q1: Can I change the pixels per inch of the image when I SAVE AS  
IMAGE? It seems to be fixed at 72 ppi. Is it possible to change it to  
300?

Q2: When I delete a feature from a LAYER by:

* clicking on TOGGLE EDITING,
* OPEN TABLE,
* selecting all the features I want to delete,
* CUT FEATURES, and
* choose TOGGLE EDITING to toggle out of editing mode,

QGIS asks me if I want to SAVE CHANGES. When I click YES, QGIS  
crashes. Is there any way I can delete fixtures from a layer?

Finally, please let me know if you would like me to put together a  
simple set of instructions for raw beginners like myself, to enable  
anyone to get QGIS up and running in a few minutes and to start  
playing around with maps. It took me most of two days (starting with  
Arc Explorer) just to understand what these mapping programs actually  
can do and how they work. And I've only touched the surface. I found  
that the pdf that came with the program is very complicated for a  
beginner.

Guy Burns
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Re: One bug, a suggestion, two questions, and an offer

CraigLeat
Guy Burns <[hidden email]> wrote:

> Date: Fri, 16 Nov 2007 16:57:20 +1100
> From: Guy Burns <[hidden email]>
> Subject: [Qgis-user] One bug, a suggestion, two questions, and an
>
> To: [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> Hi,
> <snip> </snip>
> Finally, please let me know if you would like me to put together a  
> simple set of instructions for raw beginners like myself, to enable  
> anyone to get QGIS up and running in a few minutes and to start  
> playing around with maps. It took me most of two days (starting with  
> Arc Explorer) just to understand what these mapping programs actually  
> can do and how they work. And I've only touched the surface. I found  
> that the pdf that came with the program is very complicated for a  
> beginner.
>
> Guy Burns
>
Hi Guy

Sounds like you are new to GIS and not just new to QGIS, so the
following may be helpful:

http://freegeographytools.com/2007/free-online-courses-for-open-source-gis
http://gis.coaps.fsu.edu/moodle/
http://grass.gdf-hannover.de/wiki/GRASS_Education_(Free_GIS_education)

On a different note, if this is to be a once-off exercise for you hiring
someone might be a viable option - just a thought.

Cheers

Craig Leat.
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Re: One bug, a suggestion, two questions, and an offer

Gary Sherman-2
In reply to this post by Guy Burns-2
What version of QGIS  are you using?

On Nov 15, 2007, at 8:57 PM, Guy Burns wrote:

> I'm completely new to this Grass stuff and have been trying out QGIS
> on my G5 iSight under OSX 10.4.8. One bug which almost made me go no
> further than a few minutes with it (after playing around with Arc
> Explorer for a while) was: I could not open or close LAYERS by
> ticking in the tick box.

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Chair, QGIS Project Steering Committee
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Re: One bug, a suggestion, two questions, and an offer

ebpowell-2

Gary Sherman wrote
What version of QGIS  are you using?
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I am seeing the same problem when editing shape files on QGIS v0.9.0 on Gentoo.
Have not tried editing PostGIS data yet...

Platform: AMD64.

Eric