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5 | In the current orientation, your screen's width is too small to use the NMEA 6 | Generator. 7 |
Click outside this window to close it.
5 |6 | NMEA Generator is an 7 | open-source drawing tool 8 | for generating GPS logs in 9 | NMEA format. Its 10 | primary purpose is to make it easy to draw a path representing a person 11 | walking or driving around while carrying a GPS device which measures their 12 | current position at regular time intervals (e.g. once per second). After the 13 | path is drawn, its representation as a sequence of NMEA sentences can be 14 | generated and downloaded as a text file. 15 |
16 | 17 | 18 |20 | The "Add point" tool is selected by default when the NMEA Generator is 21 | started. When you click on the map using this tool, a point is added to 22 | your path at the location you clicked on. 23 |
24 |25 | A point represents a position measured using a GPS device being carried 26 | around. The time elapsed between two consecutive points is always the same 27 | and equal to one second by default, but this can be changed under "Global 28 | settings". 29 |
30 |34 | To delete a point, select the "Delete point" tool and click on the point you 35 | wish to delete. 36 |
37 | 38 |39 | Deleting all points (clearing the map) 40 |
41 |42 | To delete all points, simply reload the application. The map view will be 43 | preserved, so you will not lose the location you are currently working on. 44 | All other settings (e.g. the GPS frequency) will however not be preserved. 45 |
46 | 47 | 48 |49 | The "Move point" tool can be used to manually move points around. To move a 50 | point, click on it first to select it: the point will then start following 51 | the mouse cursor. Clicking once again will release the point at its current 52 | position. 53 |
54 | 55 |56 | 57 | Setting latitude and longitude values for a point 58 | 59 |
60 |61 | The "Edit point" tool allows you to directly set the latitude and longitude 62 | values for a point. First, select a point, then you will be able to change 63 | its latitude and longitude values on the menu (left side). Pressing the 64 | "Enter" key will move the point to the new specified location. To release 65 | the point, click anywhere on the map. 66 |
67 | 68 |69 | 70 | Adding multiple points on a straight line 71 | 72 |
73 |75 | With the "Multi-point line" tool, you can draw multiple points along a 76 | line with the same distance from each other. When you click on the map, 77 | all preview points will be added to your path. 78 |
79 |80 | Since the time elapsed between two consecutive points is always the same, 81 | the "Multi-point line" tool represents motion along a straight line with 82 | constant velocity. The distance between consecutive points can be changed 83 | on the menu (left side), and the associated speed is shown right below it. 84 |
85 |90 | By default, the time elapsed between two consecutive points on the map is 91 | one second. To change this, click on "Global settings" and modify the GPS 92 | frequency value. This value defines how many positions are obtained per 93 | second, so setting it to 10Hz means the time elapsed between two 94 | consecutive points will be 100 milliseconds (0.1 seconds). 95 |
96 |97 | The GPS frequency is a global setting, so changing its value will affect 98 | the associated speeds at all points. As an example, increasing the GPS 99 | frequency by a factor of 10 means all speeds will be increased by a factor 100 | of 10 as well. 101 |
102 |Generating and loading NMEA files
105 |107 | After drawing the desired path, you can generate a file containing a 108 | sequence of NMEA (GGA, GSA and 112 | RMC) 113 | sentences representing the path drawn. To do that, click on the "Generate 114 | NMEA file" button. 115 |
116 |117 | You can also load an NMEA file generated with this or another application 118 | by clicking on the "Load NMEA file" button. The path represented by this 119 | file will then be drawn automatically on the map. The positions of the 120 | points are extracted from the GGA sentences. 121 |
122 |125 | 126 | Downloading and loading coordinate files 127 | 128 |
129 |131 | After drawing the desired path, you can generate a file containing its 132 | coordinates. The file will be in CSV format, with each line containing the 133 | coordinates of a point in the path (one latitude value and one longitude 134 | value separated by a comma). To do that, click on the "Download 135 | coordinates (CSV)" button. 136 |
137 |138 | You can also load a CSV file containing coordinates represented in this 139 | same format by clicking the "Load coordinates (CSV)" button. The path 140 | represented by this file will then be drawn automatically on the map. 141 |
142 |146 | To report a bug, please send an e-mail to 147 | diego@assencio.com. 148 |
149 | 150 |Who created this marvelous tool?
151 |152 | The NMEA Generator was created by 153 | Diego Assencio. 154 |
155 | 156 |Click outside this window to close it.
157 |