Information about Cetopo

Update your business with cutting-edge GIS

What can you do with the Data?
And where does it come from?


How can you do that?


Where does the Data come from?
And what can you do with it?



Features

Tutorials

Data

Selection


Ordering terrain models is traditionally done by specifying an address, rough area on a map or a property number. With Cetopo we aim to enable all of these methods in a modern way.

Address

Cetopo uses a google maps interface. You can search for addresses like Examplestreet 1 A, or locations like Rukatunturi, Nisnikun Yhtenäiskoulu or Sommaröarna.

Area on a map

Cetopo provides several tools for accurate selections in google maps. Use the rectangle tool to quickly select an area with two clicks, or use the polygon tool to select a more complex shape using as many clicks as you want. The selections can easily be modified with great detail after initial creation. We also provide tools to convert any selection to a bounding box or bounding circle.

Property

In cetopo you can search for a property using its number, or by clicking a point on the map using the one-click property selection tool. The property selection tool allows you to select the property with great precision. You can still modify the selection, for example convert it to a bounding rectangle. The property search supports properties with multiple separate boundaries.

A modern approach

Cetopo has an static annual fee. We encourage you to make a selection, download it, inspect it, modify the selection, download it, and repeat this process until you are satisfied. It costs nothing extra. You also do not pay extra for bigger maps. Want a map of the entire Lauttasaari? No problem.
The rectangle select tool
The polygon select tool
The property select tool

Contours


Contours is the main feature of Cetopo, and its original purpose. With Cetopo you can easily get accurate terrains for your projects in a fraction of the time/cost effort of traditional methods.

Data

All our data is unified in the contours product, conveniently providing accurate terrain, buildings, roads and property boundaries in one package. The contours (and additional data) are available in 3D or flattened to 2D, as by your requirements. The coordinate system can be chosen as ETRS-TM35FIN or ETRS-GKN (see Coordinates for more information).

Format

The contours are delivered as a broadly compatible dxf file. The dxf file is highly customizable to fit your CAD-style. Current customization options include:
  • Contour spacing, detail, layer name and color
  • Contours on one layer or individual layers
  • Enable/Disable highlights, layer name and color
  • Enable/Disable Roads/Buildings/Shores/Properties
  • Layer names and colors for all additional data
If you find the customization options lacking some feature, please contact us so we can see if we can fix that!

3D contours. Buildings in red, property boundaries in magenta, highlights in orange and shoreline in blue. 0.25m contour spacing.


Laser Cut


Laser cut produces contours in a laser-cut convenient format. Choose scale, material thickness and cut!

Features

Create accurate terrain models with a laser-cutter. Cetopo supports creating hollow models with a fixed offset to save material and weight. If you find the customization options lacking some feature, please contact us so we can see if we can fix that!

Mesh


The mesh is a 3D file format suitable for 3D printing, visualization and many other applications. A mesh retains all of the original data with no loss. This makes a mesh the optimal file format for advanced users who wish to do further processing of the data.

Features

Intelligent optimization with Quadric Edge Collapse reduces the file size at minimum data loss. We are still working on further optimizing the mesh feature, so expect improvements here in the future.

1.6km² mesh of Ruka.


Point Cloud


The point cloud can be imported to Autodesk Revit and other software to create an optimal terrain model.

Solid


The solid feature can be 3D-printed or CNC-milled for a perfect terrain model. Coming soon.

Image


Cetopo produces preview images of your selections. You can download HD versions of these preview images for visualization purposes.

Data

All our data is unified in the images product, conveniently providing terrain, buildings, roads and property boundaries in one view.

Features

The preview is highly customizable. All colors can be customized, the terrain gradient can be customized or even turned off. All additional data can be individually customized or disabled.

Circular selection of Lauttasaari with preview image showing elevation, buildings, roads, water and property boundaries.


Coordinates


Cetopo uses ETRS-TM35FIN- and ETRS-GKN coordinates. All Elevations conform to the system N2000.

ETRS-GKN

ETRS-GKN coordinates are highly accurate local coordinates. They are more accurate than ETRS-TM35FIN locally, but cannot be used for very large areas. One significant benefit of ETRS-GKN coordinates is that their X/Y axis is almost compass aligned. ETRS-GKN coordinates are usually prefered.

ETRS-TM35FIN

ETRS-TM35FIN is the national coordinate system. It offers good accuracy everywhere in Finland (optimal around the 27th degree of longitude). It should be used for maps spanning several degrees of longitude. This broad coverage comes at a price. The X/Y axis gets more and more rotated from the compass the further away you go from the 27th longitude.

ETRS-TM35FIN coordinates in green. ETRS-GKN in white/red/blue. We can see the ~2 degree rotation (Helsinki).


JHS Recommendation source

Selection Tutorial


Cetopo has two distinct ways to select an area on the map: Manual selection and automatic property selection.

Manual selection

Manual selection is usefull for quick, accurate selections. Read more.

Property selection

Property selection is a powerful tool if you are working with properties. Read more.

Modifying selections

Refine and fix your selections by clicking and dragging Read more.

Standard selections

Refine and fix your selections by clicking and dragging Read more.

Selection Tutorial


Manual selection

Manual selection can be done in two ways: rectangular or polygonal.

Rectangular selection

Rectangular selection allows you to select a rectangle on the map. It's the simplest of the manual selection tools. Just left-click once to define the first corner of the rectangle, and then left-click again to define the other one.
To select a new rectangle, just left-click again to start from the beginning (this will cancel your current selection).

Polygonal selection

Polygonal selection allows you to quickly select more complicated shapes on the map. It's almost as easy as the rectangle selection tool. Just left-click once to define the first corner of the polygon, then left-click as many times as you want to define the other corners. Double-left-click to select the last corner, or left-click one of the existing corners.

back to selections
continue to property selections

Selection Tutorial


Automatic property selection

Often the target of a selection is an existing property. In such cases it can be more convenient to select the property boundary using one of the automatic selection tools. A property can be auto-selected in two distinct ways: clicking or searching.

Property selection by location

Selecting a property by location is the easiest selection tool in Cetopo. Just left-click somewhere on the map to select the property at that location (if one exists). To select another property boundary, just left-click somewhere else.

Property selection by property number

If you already know the property number that you are looking for, you can type it in the property number search field in the top-left corner of the map view. If the property exists, the map will be zoomed to that location and the property will be automatically selected.
The property number search-field

Property results

When you search for properties you will get the property displayed for you as a pink filled polygon. This polygon is interactive. Moving your mouse on top of it will highlight it. Right-clicking a property polygon will bring up a small contextual menu with information.
The menu displays the property number and area. It also has buttons for selecting it, and for searching if there are more properties with this number.
A property polygon, selection, and menu

Multiple results

Sometimes a property will have multiple separate parts. This can occur for example because the property is cut in two by a road (public property), or the property may have separate parts for some other reason. Searching for a property number in the search field always displays the property-polygons of all search results. If there is more than one, then no selection will be made. This is because the results can be very far from each other, rendering an automatic selection meaningless. If you selected your property with the location tool, you can click the property-polygon, and then click Search to see if the property had more parts. If you want to select multiple properties, use the manual selection tools. You can use the property-polygons as guidance.
A property with multiple parts.

Large results

Some properties have very large and detailed boundaries. In such cases Cetopo will reduce the detail of the selection to maintain an acceptable experience. In such cases the automatic selection may not always contain the entire property, causing any downloaded products to incorrectly render the property boundaries. If your property has very detailed boundaries, such as rivers, a shore or a detailed road, consider using the manual selection tools to ensure accurate results.
Note that only the selection is inaccurate, the property boundary will be accurately written to the product of your choice.
Closeup of a very detailed property and its selection.

back to selections
continue to modifying selections

Selection Tutorial


Modifying selections

Cetopo offers a wide variety of means to modify your selections.

Changing the shape

You can change the shape of your selection by left-click-dragging the corners of the selection. It does not matter how the selection was made.
Include the small island

Adding detail

You can add detail to your selection by left-click-dragging the midpoints of the selection polygon lines. The midpoints are displayed with a slightly darker color than the corners.
Exclude the mainland.

Removing detail

You can remove corners of your selection by right-clicking the corner in question. This will open a contextual menu which allows you to delete the node.
Remove excessive detail.

Deselect

To cancel your selection, simply press ESC, or click the Clear selection button in the toolbar on the left.

back to selections
continue to standard selections

Selection Tutorial


Standard selections

Cetopo offers two ways to create consistent, accurate selections: Boundings box and Bounding circle.

Bounding box

While complex selections look cool and save bytes, they are not always what you want. Sometimes the selection should be a rectangle, plain and simple. It can be difficult to get an accurate selection with just the two clicks of the rectangle selection tool. It is also impossible to get true rectangles by dragging corners around. For this reason Cetopo includes the bounding box tool. Simply click on it in the toolbar on the left, and your complicated selection will be transformed into an accurate bounding box.
Transform into bounding box

Bounding circle

Bounding boxes are very booring. Try a bounding circle.

back to selections

Settings Tutorial


A big feature with Cetopo is the customization. We want you to feel as comfortable as possible with the products we create for you. We want to minimize the extra work you normally have to do to accomodate someone elses CAD-style.

Settings in general

When you want to create a product in Cetopo, you are greeted with this window. Pressing Download now will simply create and download the file using default settings. Clicking the small "Help" link to the right of the Settings header will take you to this tutorial. Clicking the gray Settings header will enable customization.
Clicking the Settings header will open the settings panel. The amount of settings will vary by product. The settings you will see are the default settings. Thus, clicking download now will result in exactly the same file as earlier. In the screenshot to the right you can see the three colors of settings headers. The File and Contours groups are yellow, the Highlight group is gray, and the Shores group is green. Green and gray groups are optional. The Highlights group is disabled, hence its options are hidden. Clicking the Highlights header would enable it, turning it green. Disabling a group removes that feature from the product.

You can save the new settings as default by clicking the Save Settings buttons. This is especially usefull with the Image product, since the Image products default settings are used for the previews.

Detailed tutorials


Settings Tutorial


Contours settings

The Contours product is the primary product of Cetopo. It has more customization options than any other. Here is a detailed overview of those settings

File settings

Format: The file format. Currently only .dxf is supported.
Coordinates: Read more here
Flatten: Flatten makes all Z-values 0. 3D contours are not as easy to manipulate is CAD software as 2D ones.
Detail: Cetopo produces very detailed polylines. Use the detail setting to reduce file size and increase performance. Higher values are more detailed.

Contours settings

Delta: The layer interval. A delta of 0.5m will produce a contour every 0.5 meters.
Color: The CAD-color of the main contours.
Layer Name: The layer that all contours will be drawn on.
Individual Layers: If enabled, all elevations will be put on individual layers. The layers are named "Layer Name"00xxxm", where xxx is the elevation of that layer.

Highlight settings

Enabling Highlights changes the color of every "xth" layer, creating a more visual drawing.
Delta: The highlight interval.
Color: Highlight color
Layer Name Suffix: Adds a suffix to highlight layers if Individual Layers is enabled

Shores settings

Enabling Shores will compute the shores wherever possible. This can be important because a contours drawing with delta 1m will not accurately depict a lake at elevation 10.1m.

Roads settings

Draws roads to the file. Read more here.

Building settings

Draws buildings to the file. Read more here.

Properties settings

Draws property boundaries to the file. Read more here.

back to settings
continue to image settings

Settings Tutorial


Image settings

The Image product is mainly used for previews in the map interface.

File settings

Format: The file format for downloads.

Style settings

Style: Overall style of the image. Try them!
Water Color: Color of the water
Shaded: Enables virtual sunlight
Exaggerate: Enhances height-differences when shading is used.

back to settings
continue to mesh settings

Settings Tutorial


Mesh settings

The Image product is mainly used for previews in the map interface.

File settings

Format: The file format. Currently only obj is supported, more are coming.

Compression settings

Target Polygon Count: Intelligently reduce detail in flat areas to reduce file size.

back to settings

Topology


The elevation data used in Cetopo is the Elevation model 2m (KM2) maintained by the National Land Survey of Finland (NLS). The KM2 is the latest and most advanced elevation model of Finland. It does not yet have full coverage of Finland, but it is being updated actively, with approximately 30 000km² added each year.

Elevation model 2m

The KM2 is a global leader in national elevation models. It represents the surface of Finland as a 2x2m grid with an average accuracy of 0.3m. This grid is computed from a point-cloud of spatial measurements created using airborne laser scanning. The methodology used guarantees a minimum of 0.5points/m². The elevations in KM2 are in accordance with the system N2000.

Accuracy considerations

A 2x2m grid is dense enough to accurately capture all major terrain features such as hills, roads, fields and lakes. It also shows minor features like mounds, paths, ditches and cliffs with decent accuracy. Any features smaller than the grid, such as rocks, crevaces and small pits, have a risk of not showing in the data. Steep gradients, such as cliffs, are smoothed out by the grid. For example, a vertical drop of 5m might show as a 70° slope instead.

Urban areas

KM2 describes the terrain. All buildings and structures like bridges have been removed from the laser scanned data. The KM2 is not as strong in urban areas, where discontinuities like platforms, elevated sidewalks and terraces are common.

A river in southern Finland. In the lower corner we can distinguish a ditch.


NLS source

Roads


The roads data used in Cetopo is based on the Topographic Database maintained by the National Land Survey of Finland (NLS). The Topographic Database is based on aerial photographs, scanning data and data provided by other data providers, in close cooperation with the municipalities. The accuracy of the data varies.

Road line

Roads are depicted by the road centerline in vector format. Road names, widths and attributes are not currently supported. If there is some other information you would find use for, don't hesitate to contact us so we can see if it can be added!

A circular section of Lauttasaari, Helsinki. Roads in red, buildings in orange/black and property boundaries in magenta.


NLS source

Buildings


The buildings data used in Cetopo is based on the Topographic Database maintained by the National Land Survey of Finland (NLS). The Topographic Database is based on aerial photographs, scanning data and data provided by other data providers, in close cooperation with the municipalities. The accuracy of the data varies.

Accuracy considerations

The accuracy of buildings varies. Buildings that are based on aerial photography may be incorrectly depicted.

Other structures

The Topographic Database contains many other types of structures besides buildings. Currently only piers and artificial pools are included. If there is some other information you would find use for, don't hesitate to contact us so we can see if it can be added!

A circular section of Lauttasaari, Helsinki. Roads in red, buildings in orange/black and property boundaries in magenta.


NLS source

Properties


Cadastral data used in Cetopo is based on the Cadastral Index Map maintained by the National Land Survey of Finland (NLS) and a little over 70 municipalities.

Accuracy considerations

Property boundaries can be artificial markers or natural formations such as riverbanks. In sparsely populated areas the boundary markers have been defined with an accuracy of approx. 20cm by GPS measurements since 2005. Coordinates of earlier boundary markers have been defined either by image measurement from aerial photographs or by digitalization from maps. The accuracy of these markers varies in general between 50cm and 4m, over 4m in some cases. The property areas reported by Cetopo are computed from the boundary.

Features

Cetopo supports property number search, as well as property lookup from coordinates with a point and click interface. Property numbers with multiple separate boundaries are supported. If there is some other information you would find use for, don't hesitate to contact us so we can see if it can be added!

A circular section of Lauttasaari, Helsinki. Roads in red, buildings in orange/black and property boundaries in magenta.


NLS source