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Entering Lat-Long points into some kind of Linux software  

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rleblanc
(@rleblanc)
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January 31, 2019 8:19 am  

Hi, I'm a PE, not a PLS. I'm doing residential work which mostly doesn't require survey for a septic system. I do have to accurately ( +/- a couple feet) locate tanks, pumps and field corners. I can GPS the points with non-survey quality equipment myself faster than tape measuring from a building corner. My question is how to input the points into a cad software that runs on Linux. I'm a cheap so and so. I know Civil 3d and other programs do this and I have used them. I love Draftsight which is FREE, but it doesn't speak coordinates. Google Earth does, but I've had counties complain about using it. Any thoughts? Some counties in Colorado are requiring full topo, so I'll be calling surveyors when they all get there. For now....cheap!


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Bill93
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January 31, 2019 8:59 am  
Posted by: rleblanc

 I do have to accurately ( +/- a couple feet) locate tanks, pumps and field corners. I can GPS the points with non-survey quality equipment myself faster than tape measuring from a building corner.

I wouldn't rely on a "resource grade" or "mapping" GPS unit (much less a sportsman unit) if I had to sign off on positions being within 2 ft.  If you need to report lat-lon coordinates, do you understand datums (difference between WGS84 and NAD83)?   If you only need relative positions, I'd stick to a tape or total station.


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rleblanc
(@rleblanc)
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January 31, 2019 1:01 pm  

I can invest $300 in a Trimble antenna that plugs into my Android and subscribe to a 1 foot resolution - just not sure I have enough use to make it pay. I have also seen articles saying that the Galaxy S10 will have a new GPS chip accurate to 1 foot. I know this is sacrilege! I will gladly call surveyors when they require me to have site topo. 


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Bill93
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January 31, 2019 3:06 pm  

Indeed, would it pay?

1 ft on which datum? You havent indicated that you are familiar with such things. Mislabeling the coordinates with the wrong datum would be around a 3 ft error for many places in the US.


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MightyMoe
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January 31, 2019 3:14 pm  

There are a number of agencies that require Lat, Long data for permits and filings, but those lat, longs only have to be to hand held accuracy. An example would be a domestic water well. They just need to get close enough to find it to do inspections. septic tanks would be similar I would imagine. It isn't an OPUS thing. 


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GeeOddMike
(@geeoddmike)
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January 31, 2019 4:42 pm  

As for the original question, how to enter coordinates into a piece of Linux software you have, I don’t know how anyone other than the software developer can answer. I would have hoped the answer would be in the manual or help file.

When I write software, I do so for my own use. If  someone requests a copy, I generally add a menu of options as to datums, epochs, entry formats (DMS or decimal), etc. I only work in meters to avoid issues of what type of feet units. 

Perhaps there is a parameter file where the options I mentioned are entered.

HTH,

DMM

“To be surprised, to wonder, is to begin to understand,” - Ortega y Gasset


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Paul in PA
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February 1, 2019 5:54 am  

I take it you are using the Free version of Draftsight and do not want to spend $150 to get the Pro version. I assume the Free version is a sketching tool that allows you to put notations on a scaled drawing and that the Pro version does in fact accept coordinates. Well, time is money in the real world, so how much of your time do you want to spend asking others to help you get something for free? Pretty much everyone here is professional in that we understand that concept and are willing to spend money in order to save time. BTW, there is free software out there that accepts coordinates, but I have no time to keep track of it for others.

Paul in PA, PE, PLS


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rleblanc
(@rleblanc)
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February 5, 2019 10:30 am  

Good question - that's why I openly admit I'm a PE not PLS. I have a PLS I can ask and since I'm always in the same region, hopefully won't be a problem.


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rleblanc
(@rleblanc)
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February 5, 2019 10:34 am  

Actually Paul, the Pro version doesn't do coordinates either - it just has the ability to batch print and get more canned details ready-made. Not too much more bang for me. Not even sure Autocad LT does coordinates. Civil 3D certainly does. See previous post where I indicated I'm cheap and per the other poster, yes this is wells and septics, I just want something a bit better than Garmin.


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half bubble
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February 5, 2019 10:43 am  

QGIS is what you seek on Linux.

Get the GPS data into QGIS, possibly as a .gpx file, probably as WGS84 datum, and convert to state plane and feet or whatever works.

It's difficult to entice new people into the profession without discussing proctology.


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Norman Oklahoma
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February 5, 2019 11:50 am  

I can appreciate cheap, but you, the OP, might be carrying things just a little too far. Freeware operating system, freeware CAD, positions from your phone....

"Convention is like the shell to the chick, a protection till he is strong enough to break it through." Learned Hand


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MightyMoe
(@mightymoe)
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February 5, 2019 12:42 pm  
Posted by: Norman Oklahoma

I can appreciate cheap, but you, the OP, might be carrying things just a little too far. Freeware operating system, freeware CAD, positions from your phone....

yeah, we might be the wrong group to be asking for the cheapest versions of surveying solutions. 


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rleblanc
(@rleblanc)
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February 5, 2019 12:46 pm  

Yeah, I know, but non licensed probably don't know what's missing!  So I thought I'd ask.


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Norman Oklahoma
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February 5, 2019 4:05 pm  
Posted by: rleblanc

Yeah, I know, but non licensed probably don't know what's missing!  So I thought I'd ask.

Nothing wrong with cheap if it works. There are cheap CAD packages that would probably do what you want. For a couple hundred dollars you could be running IntelliCAD, for example.   

"Convention is like the shell to the chick, a protection till he is strong enough to break it through." Learned Hand


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Steven Metelski
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February 10, 2019 7:36 pm  

The problem with lat-long is what datum? Is it wgs84? Geodetic? Geocentric?

Pushing a button and getting a number does not make it right.

As a comparison, it would be like giving you elevations and forgetting to mention what datum they are based on.

NJPLS


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