SPECIFICATIONS:
All the elements which type is “area” you should capture with line string but it is a closed element in
the edition work after restitution.
All the elements which type is “line” you also should capture with line string.
All points elements you should capture with a cell element.
IMPORTANT NOTE:
THIS IS VERY IMPORTANT- Use only the useful area of the model, don’t capture elements outside of
the limits of the models – this is very important, If you acquire elements out of the useful area it
might be possible that those elements be with planimetric and/or altimetric errors.
Features along Boundary
The acquisition of linear/area elements, should have little extension along the boundary and
buildings/constructions can´t be split on the boundary.
Example 1
Example 2
Wrong way to acquire building
Correct way to acquire building
Spot heights on the top of the buildings are to be capture
IMPORTANT NOTE:
THIS IS VERY IMPORTANT-One part of the quality of the project
1 – All hydrography must be continuous throughout the area and should be capture using monotonic
mode ,the lines should always have continuity.
2- Hydrography must be split on the intersections.
3 – When hydrographical elements intersect topographic features, should have common vertex and
height (z) should be same.
We can´t accept any type of this errors
RULES
HYDROGRAPHY:River, creek, riverside, streams, ditch and irrigation ditch, those elements are to be
acquired by borders whenever it’s width exceeds >or= 5 meters, otherwise it’s acquires by its AXIS.
The height of the both margins/borders of river, riverside and streams needs to be the same.
Lake and Dam are to be acquired by the level(height) of the water - You must acquire the lakes
with the same height (z) ( lakes are water plan).
Water line – It is defined by a single line and its corresponds to the way where rainwater flows, even
though if it is seasonal;
Whenever a stream or water line is underground or below something, there are to different features
that you ought to use: Covered stream and covered water line.

In example below we have a dam wall with the respective lake, in cases like this, we have
also to acquire breakline. The lake is the inferior limit of one side of the dam wall, and the
breakline is the inferior limit of the other side of the dam wall.
Example 3
Aqueduct – human made structures, on the edge of roads, used for letting the water flow from one
edge to the other.
Example 4
Water tank - It is defined by the wall which encloses the water plane in a rural area. When its area
is superior to 20 m2, it must be drawn by its limits. When its area is inferior to 20 m2, it must be
acquired by a cell;
TOPOGRAPHIC FEATURES: natural steep slope, artificial steep slope, land levelling, terrace, and
supporting walls are acquired when the difference in height exceeds >or =1.6 meters. ALL THESE
ELEMENTS ARE TO BE ACQQUIRED AT GROUND LEVEL. Theyare
necessary to generate an
accurate DTM.
You need to associate a breakline to terrace and to all supporting walls.
ALL THE SUPPORTING WALL ARE TO ACQUIRED AT THE GROUND LEVEL
IMPORTANT NOTE:
YOU CAN´T USE BREAKLINE TO DEFINE PLANIMETRY ELEMENTS, CAN´T BE USE TO CLOSE AREAS,
CAN´T BE USE TO DEFINE/ROAD/STREET/PATHS.. For example, if you have one supporting wall that
is coincident with the road, in this cases you need to acquire the breakline at bottom but also the road
(2 elements). For us the breakline is to be use to generate accurate DTM – is taking off on planimetry
Land levelling – is a line that defines the beginning of a slope near roads. See Example 5
Terrace: is a line that shows a human made level shelf of land interrupting a declivity, often used in
agriculture. SeeExample 6
Example 5
Example 6
ROAD NETWORK: all the roads are acquired by the borders, excluding the pathways and rough track,
pathways rough track are acquired by their AXIS.
If one fence or hedge plants or brick/stone wall define the limit of asphalt/soil road – that’s ok for us,
if not, you have to acquire the limit of asphalt/soil road.
It’s also important that access to the houses(must be with asphalt or soil), be acquire by the limit not
by the middle point
IMPORTANT NOTE:
Pathwayarewalking paths where you cannot drive a vehicle and only a man can walk.
Rough Track it’s a permanent rural/agricultural soil road, it’s acquire by the axes/middle point, it
can´t be used to give access to separately houses , only tractor vehicle can ride or animal with cart
can ride
Soil road, it’s acquire by the limit (not by the middle), you can drive a vehicle, and give access to
houses.
Asphalt road, it’s acquire by the limit (not by the middle), you can drive a vehicle, and give access
to houses.
In rural urban areas, sometimes is difficult to difference between alphalt or soil road, but the
important is to acquire the road by the limit/borders, or by the fence, wall or by hedge plants if those
exists, not by the middle point.
Firebreak path or Steel-Worker: use this feature only in areas of forest, eucalyptus, pinetrees,
cork-oak and holm oak
Separating Rail: if exist and it’s coincident with the borders of the road/highway, them the
separating rails are acquired on same height of the road – see Example 7
Example 7
BRIDGES: if the width between road and bridge is >3.0 meter then you’ll have to acquire the
borders of the road and also the borders of the bridge, otherwise you acquired only the borders of
bridge.
Walls/Fence/Hedge of plants:

If the wall/fence/hedge of plants are coincident with the borders of the road/highway, then
you should acquire only the wall/fence/hedge of plants.

If the distance between wall/fence/hedge of plants and the road exceeds 0. 80m then you
have to acquire the both elements, otherwise you acquire only the wall/fence/hedge of plants.
BUILDINGS, DIVERSE CONSTRUTIONS AND SOME DIVERSE AREAS:Some buildings and constructions
are acquired with the feature lim_constrution and inside of the area you need to place the respective
cell (but only one cell is allowed by area). The lim_constrution define close areas. See example
below.
Example 8
If you find BURNED AREAS them use the cell “AAF”.
In the image we recognize one private propriety surrounded by a wall and the vegetation area
without the area of the house is less than 0.25 hectare – the area of the private garden is less
than 0.25 hectare.
In cases like this – only for private propriety and only the ones that are surrounded by a wall or
fence and also for areas less than 0.25 hectare – the areas with all those conditions will be
without classification on the vegetation types.
Example 9
In the example we have acquire this kind of areas by this way (see example below)
With this rule, the area will be like this (see picture below):
Example 10
About statue, chapel, ruin with history, tent, hut, large shed, silo, windmill, windmill, toll,
peag , water reservoir, subterrain water reservoir, high voltage cabin, antenna and water
tanq if the area or the diameter/diagonal of those elements is <20 meter them you have to acquire
those elements by a cell. If not them those are collected by the limit of the element.