Transportation
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Road & Road Related Polygon
Project Content
1.1 road
1.2 intersection
1.3 road_overlap
1.4 inside_parking
1、Road surface
Road surface, includes：
1.1 Road （The requirement is the same as the “road” in landcover projects）
1.2 Intersection
1.3 Road_overlap（The requirement is the same as the “road_overlap” in landcover projects）
1.4 Inside_parking
Pay attention: If there is an overpass, the lower road surface polygons need to be all deleted. Only draw the elevated road surface, which means just draw what you can see.
1、Road surface
1.2 Intersection: intersection will be divided into “road_intersection” and “virtual_intersection”.
Road_intersection: The junction of three or more than three roads. The vehicles can do left turn, right turn, or U turn here to change their driving directions. These intersections usually will have some traffic facilities to control the traffic flow, such as stop line, crosswalk, traffic light, etc.
Drawing rule: If there is a median near the intersection, the intersection boundary should be cut at the median.
The road_intersection can be divided into：
Virtual_intersection: The following three scenarios need to be drawn as virtual_intersection.
Scenario 1. There is only one road and there are medians in the middle. The open area of two medians or the ending point of a median should be drawn as intersection.
Rule: cut the road at the end of the median, mark as virtual_intersection. Notify that the cutting should touch the end of the median.
Scenario 2. The merging and diverging points between the ramp and the main road should be drawn as intersection. Usually we will see painted median or gore area here.
Rule: cut the road at the merging or diverging points (the tip of the gore area or painted median). Pay attention: the tip of the gore are or painted median should be within the intersection.
Scenario 3. The merging and diverging points between two roads.
Rule：cut the road at the merging or diverging points of these two roads.
1、Road surface
1.2 Intersection - road_intersection
The junction of three or more than three roads. The vehicles can do left turn, right turn, or U turn here to change their driving directions. These intersections usually will have some traffic facilities to control the traffic flow, such as stop line, crosswalk, traffic light, etc.
Drawing rule: If there is a median near the intersection, the intersection boundary should be cut at the median.
Example It is a junction of four roads from 4 different directions. Cut the intersection area and mark it as “road_intersection”.
Road intersection
Road intersection
1、Road surface
Example There are two medians near the intersection. The intersection boundary should touch the median.
1.2 Intersection - road_intersection
The junction of three or more than three roads (common road_intersection). The vehicles can do left turn, right turn, or U turn here to change their driving directions. These intersections usually will have some traffic facilities to control the traffic flow, such as stop line, crosswalk, traffic light, etc.
Drawing rule: If there is a median near the intersection, the intersection boundary should be cut at the median.
1、Road surface
Example Only need to draw the intersection in the blue circle. The intersection can’t include the road on right side because there is median to separate it from the left side road.
1.2 Intersection - road_intersection
The junction of three or more than three roads (common road_intersection). The vehicles can do left turn, right turn, or U turn here to change their driving directions. These intersections usually will have some traffic facilities to control the traffic flow, such as stop line, crosswalk, traffic light, etc.
Drawing rule: If there is a median near the intersection, the intersection boundary should be cut at the median.
This is median
Correct result
1、Road surface
Example A very simple and common intersection in a residential area.
1.2 road_intersection
The junction of three or more than three roads (common road_intersection). The vehicles can do left turn, right turn, or U turn here to change their driving directions. These intersections usually will have some traffic facilities to control the traffic flow, such as stop line, crosswalk, traffic light, etc.
Correct result
1、Road surface
Example Signal_controlled intersection. Usually there is a traffic light for a big intersection. Also there will be stop line and crosswalk. On the image, we can see the long traffic signal pole (red arrows) on the top of the road and the shadow (yellow arrow).
1、Road surface
Example Stop_controlled intersection. Must see stop line (yellow arrow) without any traffic light.
1、Road surface
Example Uncontrolled intersection. The intersection has no traffic light and no stop line.
Pay attention：Don’t take the street light as traffic signal. Traffic signal is straight with multiple lights on it. While street light only has one light on it.
1、Road surface
1.2 Intersection - virtual_intersection
Scenario 1. There is only one road and there are medians in the middle. The open area of two medians or the ending point of a median should be drawn as intersection.
Rule: cut the road at the end of the median, mark as intersection. Notify that the cutting should touch the end of the median. Learn more about the median in the following content.
Example - The open area of two medians. The arrow shows the open area of two medians. Vehicles can do U turn here, or do left turn or right turn into the nearby driveway. It is a virtual intersection. The cutting should touch the end of the median.
Correct result
Cutting location
Cutting location
1、Road surface
Example - The open area of two medians. The green circles show the open area of two medians. Should draw intersection there.
Example - The ending point of one median. The red circle shows the ending point of a median. Should draw intersection there as well.
1.2 Intersection - virtual_intersection
Scenario 1. There is only one road and there are medians in the middle. The open area of two medians or the ending point of a median should be drawn as intersection.
Rule: cut the road at the end of the median, mark as intersection. Notify that the cutting should touch the end of the median. Learn more about the median in the following content.
1、Road surface
Example - Median but no open area, don’t draw intersection. The arrow shows a median which formed by a shared lane. However, there is no open area of this median. So don’t draw intersection here.
1.2 Intersection - virtual_intersection
Scenario 1. There is only one road and there are medians in the middle. The open area of two medians or the ending point of a median should be drawn as intersection.
Rule: cut the road at the end of the median, mark as intersection. Notify that the cutting should touch the end of the median. Learn more about the median in the following content.
Median but no open area, don’t draw intersection
1、Road surface
Example - Two types of medians connected. There is no open area. Don’t draw intersection here. The circle shows that a painted median formed by a shared lane connects to a raised median. There is no open area here. So don’t draw intersection.
1.2 Intersection - virtual_intersection
Scenario 1. There is only one road and there are medians in the middle. The open area of two medians or the ending point of a median should be drawn as intersection.
Rule: cut the road at the end of the median, mark as intersection. Notify that the cutting should touch the end of the median. Learn more about the median in the following content.
1、Road surface
1.2 Intersection - virtual_intersection
Scenario 2. The merging and diverging points between the ramp and the main road should be drawn as intersection. Usually we will see painted median or gore area here.
Rule: cut the road at the merging or diverging points (the tip of the gore area or painted median). Pay attention: the tip of the gore area or painted median should be within the intersection.
Example - The merging and diverging points between the ramp and the main road. Cut the road at the merging or diverging points. Notify that the tip of the gore area or painted median should be within the intersection.
1、Road surface
Example - The merging and diverging point between two ramps/roads. Cut the road at the merging or diverging points. Notify that the tip of the painted median should be within the intersection.
1.2 Intersection - virtual_intersection
Scenario 2. The merging and diverging points between the ramp and the main road should be drawn as intersection. Usually we will see painted median or gore area here.
Rule: cut the road at the merging or diverging points (the tip of the gore area or painted median). Pay attention: the tip of the gore are or painted median should be within the intersection.
cut the road at the merging points of gore area
Not behind the yellow solid line
1、Road surface
1.2 Intersection - virtual_intersection
Scenario 3. The merging and diverging points between two roads (virtual_intersection).
Rule：cut the road at the merging or diverging points of these two roads.
Example - The merging and diverging points. The arrows show the merging and the diverging points of these two roads. Draw as intersection.
1.4 inside_parking
The parking area inside the road surface. Pay attention：as long as you can tell the area for parking, you should take it as inside parking.
Rule: draw the parking area. The inside parking should overlap the road.
1、Road surface
1、Road surface
1.4 inside_parking
The parking area inside the road surface. Pay attention：as long as you can tell the area for parking, you should take it as inside parking.
Rule: draw the parking area. The inside parking should overlap the road.
2、BOC
2. BOC (Back of Curb)
Pay attention：Road boundary should include BOC. So BOC should overlap with road.
Street view
Sidewalk
BOC
Road surface
2、BOC
2. BOC
Pay attention: Road boundary should include BOC. So BOC should overlap with road.
3、Road related polygon
3.1 median（6 sub-types）
3.2 crosswalk（6 sub-types）
3.3 no_parking_area
3.4 bump_area
3.5 solid_keep_clear
3.6 yellow_dome（not overlap with road，but might be overlap with raised median and refuge island）
Except for indication, all other features should overlap with road.
3.1 Median（6 sub-types）：a physical or painted dividing area that separates lanes of traffic to enhance traffic safety by preventing collisions. Most of the medians are in the middle of the road or near the intersection. Some medians are at the merging or diverging points of the ramps (gore_area). Need to distinguish with no_parking_area (no_parking_area usually is by the roadside).
Medians can be divided into：
Rule: draw the median boundary. Then classify them as different sub-types.
3、Road related polygon
Draw the median boundary.
3.1 Median - painted_median
A painted median is a road surface marking created with spray paint to designate an area where vehicles are not allowed to drive.
Rule: draw the median boundary. Painted median is part of road surface, so must be overlap with road.
3、Road related polygon
画出隔离带外轮廓
3、Road related polygon
画出隔离带外轮廓
3.1 Median - painted_median
A painted median is a road surface marking created with spray paint to designate an area where vehicles are not allowed to drive.
Rule: draw the median boundary. Painted median is part of road surface, so must be overlap with road.
3、Road related polygon
Example - blue area is painted median. Red arrow shows an area which allows vehicles entering the nearby parking lot. So this area is not median.
Painted median
Painted median
Not median
3.1 Median - painted_median
A painted median is a road surface marking created with spray paint to designate an area where vehicles are not allowed to drive.
Rule: draw the median boundary. Painted median is part of road surface, so must be overlap with road.
3、Road related polygon
Example - Both red arrows show the painted medians. These areas are the tapered end of the raised median. They are also served as separate the traffic flows. They are marked as spray paint. Usually they are composed of two double yellow lines or two single yellow lines.
3.1 Median - painted_median
A painted median is a road surface marking created with spray paint to designate an area where vehicles are not allowed to drive.
Rule: draw the median boundary. Painted median is part of road surface, so must be overlap with road.
3、Road related polygon
Example - The red arrows shows painted medians. These two areas are also the tapered end of the triangle raised median. They are also served as separate the traffic flows. They are marked as spray paint.
3.1 Median - painted_median
A painted median is a road surface marking created with spray paint to designate an area where vehicles are not allowed to drive.
Rule: draw the median boundary. Painted median is part of road surface, so must be overlap with road.
3、Road related polygon
Example - the arrows show a painted median. This area is enclosed by two solid dash yellow lines (solid dash line: one solid line combined with one dash line) which indicates a shared lane. The shared lane needs to be drawn as painted median.
Correct result
Solid dash line
3.1 Median - painted_median
Pay attention: the shared lane should be draw as painted median!
Rule: draw the median boundary. Painted median is part of road surface, so must be overlap with road.
3、Road related polygon
Example - The area in the circle is painted median. This area is enclosed by two solid dash yellow lines (solid dash line: one solid line combined with one dash line) which indicates a shared lane. The shared lane needs to be drawn as painted median.
Correct result
3.1 Median - painted_median
Pay attention: the shared lane should be draw as painted median!
Rule: draw the median boundary. Painted median is part of road surface, so must be overlap with road.
3.1 Median - painted_bike_median
Pay attention: the painted median used for separating vehicles and bikes needs to be marked as “painted_bike_median”.
Rule: the same as painted median. Should overlap with road.
3、Road related polygon
Example - These are painted_bike_median. These medians are used for separating vehicles and bikes to guarantee the safety of bikes.
3.1 Median - raised_median
Raised median is raised concrete median.
Rule: draw the median boundary. Raised median is not part of road surface, so don’t overlap with road.
3、Road related polygon
3、Road related polygon
3.1 Median - raised_median
Raised median is raised concrete median.
Rule: draw the median boundary. Raised median is not part of road surface, so don’t overlap with road.
3.1 Median - raised_median
Pay attention: if a raised median connects to a painted median, there should be no gap between these two medians. If there is BOC around the raised median, the painted median should overlap with the BOC.
3、Road related polygon
Painted_median boundary should snap to raised_median boundary.
3、Road related polygon
3.1 Median - raised_median
The concrete wall in the middle of highway is also raised median.
Rule: draw the median boundary. Raised median is not part of road surface, so don’t overlap with road.
3.1 Median - raised_bike_median
Pay attention：the raised median used for separating vehicles and bikes needs to be marked as “raised_bike_median”.
Rule: the same as raised median - not overlap with road.
3、Road related polygon
3.1 Median - vegetation_median
Vegetation median is a median with vegetation planted on it.
Rule: draw the median boundary. Vegetation median is not part of road surface, so don’t overlap with road.
3、Road related polygon
3、Road related polygon
Raised median
Vegetation median
Vegetation median
Raised median
Raised median
3.1 Median - vegetation_median
Rule: A median with mixed materials should be marked as different types of medians based on the material in each section.
3.1 Median - gore_area
Gore area is the painted area located at the merging area of a ramp and the main highway. It is typically long and triangular in shape.
Rule: draw the gore area boundary. Gore area is part of road surface, so should be overlap with road.
Pay attention: the base of triangle should align with the edge of the road.
3、Road related polygon
正确结果
3、Road related polygon
Example The yellow areas are gore areas. Pay attention, the arrows show the base of the triangle which also the edge of the road.
正确结果
Correct result
This boundary is also road boundary
3.1 Median - gore_area
Gore area is the painted area located at the merging area of a ramp and the main highway. It is typically long and triangular in shape.
Rule: draw the gore area boundary. Gore area is part of road surface, so should be overlap with road.
Pay attention: the base of triangle should align with the edge of the road.
3.2 Crosswalk（6 sub-types）
Rules: draw the crosswalk boundary. Classify them as different sub-types.
Pay attention: when there is a BOC, the crosswalk boundary should snap to BOC boundary.
3、Road related polygon
Draw the crosswalk boundary
Snap to the boundary of road
3.2 Crosswalk - crosswalk_standard
3、Road related polygon
3.2 Crosswalk - crosswalk_continental
3、Road related polygon
3.2 Crosswalk - crosswalk_ladder
3、Road related polygon
3.2 Crosswalk - crosswalk_other
The following crosswalk should be marked as crosswalk_other. Including but not limited to the following types.
3、Road related polygon
3.2 Crosswalk - refuge_island
Refuge island is the part of raised median that allows pedestrians walking through。It has the same function of normal crosswalk.
Rule：draw the refuge island boundary.
Pay attention: It should overlap with raised median.
3、Road related polygon
The area for pedestrian is refuge_island
Refuge_island
The whole piece is raised median
3.2 Crosswalk - mid_block_crossing
It is located at the middle of the road, not at the intersection. No matter what the pattern of the crosswalk, as long as it is in the middle of road, we should mark it as mid_block_crossing.
3、Road related polygon
Crosswalk at non road intersection
3.3 no_parking_area
Parking is not allowed in the no_parking_area.
Pay attention: No parking area is located by roadside. Need to be distinguished with painted median.
Rule: draw the no_parking_area boundary. Need to be overlap with road.
3、Road related polygon
Correct result
3、Road related polygon
Correct result
Example The striped area near the roadside indicates a no parking area.
3.3 no_parking_area
Parking is not allowed in the no_parking_area.
Pay attention: No parking area is located by roadside. Need to be distinguished with painted median.
Rule: draw the no_parking_area boundary. Need to be overlap with road.
3.3 No parking area - box_junction_area
There is a special scenario of no parking area, which is called box junction area. It usually covers an entire road segment. It is composed of one or multiple spray paint crosses in the area. This box junction area doesn’t allow vehicles parking on it.
Rule: draw the box junction area boundary. Need to overlap with road.
3、Road related polygon
Example - Arrows show the areas with crosses on it. Need to draw as box junction area.
3.4 bump_area
Rule: draw the bump area boundary. It is a long and bulge area on the road surface. Need to overlap with road.
3、Road related polygon
Correct result
3.4 bump_area
Rule: draw the bump area boundary. Need to overlap with road.
3、Road related polygon
Correct result
Correct result
3.4 bump_area
Rule: draw the bump area boundary. Need to overlap with road.
3、Road related polygon
Correct result
3、Road related polygon
3.5 solid_keep_clear
You will see “keep clear” in this area. This area doesn’t allow vehicles to stay inside when there is a traffic jam. All vehicles need to wait outside of this area.
Rule: draw the keep clear area boundary (shown as green lines).
3、Road related polygon
3.6 yellow_dome
Yellow dome is used to alert visually impaired pedestrians to enter the intersection from this location. Sometimes yellow dome also will be located at the refuge island.
Rule: draw the yellow dome boundary. If it is right beside the road, we need to snap it to the road boundary.
Located at road intersection, it’s a small yellow box
Correct result