I already have "pip" as "pip" is pre-installed in Python 2. I have tried to install the Python module with the correct name "pykalman" from within Windows Command Prompt and not the Winows Python Interpreter. Still, I am getting errors as follows:. In your answer screenshot you opened the python interpreter in your command prompt by typing python. This is where you can write python code, but it is not how you install new python packages.
EDIT: I just tried installing pykalman-master and that is the wrong package name. Use this instead. EDIT 2: I see your updated error message. You have pip installed correctly, and you have the path set correctly, so no worries about any of that.
This is clear because "Collection pykalman" is printed to the console meaning pip is working. The issue in this case seems to be a firewall on your network that blocks access to the pypi server where pip looks for python packages. Here are other people with similar problems. This is really beyond the scope of GIS Stack Exchange at this point, but to save you time digging through forums and to give a little bit more context You could either talk to your network admin to open the firewall and once you read the rest of this you may see why that would be worth itor you could download the pykalman source code and install it directly.
This is really not so hard don't be intimidated!
To test that you have installed pykalman or any python packagerun the python interpreter python and try import pykalman. If no errors, you are good to go. HOWEVER: The problem with installing this way is that it won't automatically install all of the other python packages that are pykalman's dependencies numpy scipy Sphinx numpydoc and nose.
I'm pretty sure ArcGIS's python install comes with numpy and scipybut I doubt you have the others. Meaning, you would likely have to manually install those packages too.
To install using pipif it is correctly installed, I think all that you need to do is:. My goal is to install 'rdp' Ramer-Douglas-Peucker algorithm third party python module. First, run your command prompt application as Administrator. In console, I ran this command:. Sign up to join this community.
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Source code for rdp
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The Ramer-Douglas-Peucker algorithm is an algorithm for reducing the number of points in a curve that is approximated by a series of points.
Ramer, Urs. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Python Makefile. Python Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commit…. Installation pip install rdp. You signed in with another tab or window.
Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I recently implemented the RDP polygon approximation algorithm in Python and I'm skeptical of whether or not I implemented it correctly of with the greatest efficiency. The algorithm runs in around 0. Also, there seems to be a cap as to the number of points that can be removed by the algorithm, or at least there's a cap in my implementation.
Could I be doing something wrong? If you want to calculate the farthest point you don't need to use the square root for 'real' distance calculation. This is quite an old question, yet I'd like to answer because it comes up if one searches for "Python Ramer-Douglas-Peucker" on the internet.
Knowing how the algorithm works, it should be clear that the number of points in the input should not be the driving variable determining the number of output points. Instead, the tolerance should matter.
Let's use Hypothesis to generate some test cases. Our properties are easy: The resulting poly-line should have length 2, and the first and last point are the same as the input poly-line.
You should see that this fails: AssertionError: 77! The code only drops the middle point if the recursive input has length 3 special case at the beginning and the max distance is larger than tolerance.
Next, let's have a look at your 'TODO' comment, where you put the two recursion results together:. So just return the first list except for the last point.
This also avoids a bug, where you have the same point multiple times. Like [A, b, c, A, d, e, f]. The second A would've been removed. More could be said about the fact that you are using recursion if you care about performancethe special case handling at the beginning of the implementation not needed -- however, this question is too old for anyone to care.
You can simplify your distance function with the function math. Morevoer, the CPython implementation should be based on the underlying C function hypot ; therefore, this function is safer than the naive implementation since it does its best to avoid overflows and underflows at an intermediate stage of the computation.The Ramer—Douglas—Peucker algorithmalso known as the Douglas—Peucker algorithm and iterative end-point fit algorithmis an algorithm that decimates a curve composed of line segments to a similar curve with fewer points.
The purpose of the algorithm is, given a curve composed of line segments which is also called a Polyline in some contextsto find a similar curve with fewer points. The algorithm defines 'dissimilar' based on the maximum distance between the original curve and the simplified curve i. The simplified curve consists of a subset of the points that defined the original curve. The algorithm recursively divides the line.
Initially it is given all the points between the first and last point. It automatically marks the first and last point to be kept. It then finds the point that is farthest from the line segment with the first and last points as end points; this point is obviously farthest on the curve from the approximating line segment between the end points.
A Simple Way to Find Turning points for a Trajectory with Python
The algorithm recursively calls itself with the first point and the farthest point and then with the farthest point and the last point, which includes the farthest point being marked as kept. When the recursion is completed a new output curve can be generated consisting of all and only those points that have been marked as kept. The algorithm is used for the processing of vector graphics and cartographic generalization.
It does not always preserve the property of non-self-intersection for curves which has led to the development of variant algorithms . The algorithm is widely used in robotics  to perform simplification and denoising of range data acquired by a rotating range scanner ; in this field it is known as the split-and-merge algorithm and is attributed to Duda and Hart.
From Wikipedia, the free encyclopedia. Image and Vision Computing. A comparison of line extraction algorithms using 2D range data for indoor mobile robotics PDF.
A trajectory is the path that a moving object follows through space as a function of time. Usually, we work with its discrete representation by calculating space positions with some interval. For simplicity, let's consider only 2-dimensional space and ignore possible changes in Z coordinate.
Therefore, our trajectory is a time series of data points x, y that represent position on a plane XY and have been calculated with some time interval. A turning point is just a changes in direction. Such points are valuable features for the trajectory analysis because they can define trajectories in a space imaging you want to explain a path to someone, then you usually describe it in such turning points: "turn left, go 20 meters and turn right, go straight until you reach Starbucks, then turn right again.
It's quite easy to find such turning points for humans on a plot, but a bit more tricky to do that automatically. A human brain can also quite fast detect valuable turning points when change in direction is significant e. In order to let machine make such analysis we need build a simple approximation to our trajectory curve where we can highlight such fractures. The best choice for this is Ramer-Douglas-Peucker algorithm or RDP that gives us a piecewise approximation to our trajectory curve where every fracture could be treated as a turning point.
Trajectory can have many small noisy turns e. Same as our brain do that, we want machine to filter them out too. In the code below we use rpd 0.
Read More Ramer-Douglas-Peucker algorithm RDP is an algorithm for reducing the number of points in a curve that is approximated by a series of points.Check Out My GitHub!
The project has the dual intention of challenging the social norm of having to purchase water when there is a public or private water tap present and of providing a technological platform for the public to locate and share known sources of water. My work with Phlask has been on the page with the web map. As long as a valid Google Maps Geocoding API key is provided the list of addresses separated by newlines provided will be geocoded and the resulting output written to the Results box at the bottom of the page.
Additionally, there is a checkbox that when checked will display the input addresses on the map as they are geocoded. This slows down the process but allows you to quickly see where the points are falling. The API key at the top of the page can be swapped with a personal API key if the one provided reaches the daily limit so you can continue to geocode addresses.
This script will simply a linestring or a polygon in the form of a shapefile to varying degrees based on the epsilon value passed to the algorithm. The original line or polygon is then plotted along with the result of running the algorithm on the shape to show the effect the algorithm had.Пишем бота с компьютерным зрением для игры Google Динозавр на языке Python
This project involved translating the RDP algorithm from pseudocode to python, handling file io with the fiona library, handling plotting with matplotlib's pyplot library, and writing the supporting PEP compliant code to make all the pieces work together. Because many store directory pages have a similar HTML structure I combined the common scraping patterns I use into one file to allow me to assemble scrapers more quickly.
All of these scraping patterns rely on the BeautifulSoup scraping library. This script has to be modified to be used for a particular site and serves as a template to build directory web scrapers.
The build scraper function allows you to chain types of page scrapes as you move throughout a directory and is one of the two functions called when the script is run. These values are then appended to a list of which is later used to write to a.Released: Dec 19, Pure Python implementation of the Ramer-Douglas-Peucker algorithm. View statistics for this project via Libraries. Tags rdp, ramer, douglas, peucker, line, simplification, numpy. The Ramer-Douglas-Peucker algorithm is an algorithm for reducing the number of points in a curve that is approximated by a series of points.
Project links Homepage. Maintainers fhirschmann. Installation pip install rdp. Project details Project links Homepage. Release history Release notifications This version. Download files Download the file for your platform. Files for rdp, version 0. Close Hashes for rdp