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Geoinformatics_06-2009
review the case. the charger can charge two batteries at the same time. only one li-ion battery is needed for this system, which is supplied with two batteries. during the test one battery lasted almost five hours with gps and modem (ntrip) in use most of the time. the unit has a color display which is very clear indoors, but outside you need to make sure that the light hits the display at the right angle. data can be stored on the instrument s internal memory or on an additional sd card. when i wanted to transfer the data from the unit to the computer i had a usb stick in my hand, but this unit does not offer this option. so it is either the sd card or a usb cable. only two buttons are on the unit, apart from the power button, the esc and the ent key. i did not manage to switch between applications, which is strange for a windows mobile operated system. by pressing the esc key a bit longer you can activate the start button to launch another program. so, you can run more than one application at a time, but switching with alt esc is no longer possible. understanding the setup of a grs-1 was difficult for me in the beginning due to the number of options available. below is an overview of the different setups i could make with the instrument supplied to me: data collector for controlling other hardware. a handheld gis receiver with gps and figure 1: the complete rtk set fits in a small box testing method we chose to do a user test, which means that standard deviations and so on were not considered. the configuration as supplied was as follows: instrument: ext antenna: software: grs-1 pga-1 topsurv 7.2.3 topcon link 7.2.3 delivery and instructions the instrument was delivered as a complete working set. all fit into a small rugged case. the user manual was not in the case, but in a special binder, together with the grs-1 leaflet and quick reference guides. instruction was given indoors and outside by the dutch support person and the european support manager topcon survey products. glonass on l1. this looks like a data collector, but has everything already built in. the same as the previous solution, but with egnos correction to improve the accuracy. a gis unit with correction dgps signal from a local correction supplier via ntrip. this is the first solution which clearly comes within the accuracy of a meter. here you can also consider attaching to an external antenna. these first three solutions all work with the gis module of topsurv. a handheld rtk receiver with the gps+ module of topsurv using gps and glonass on l1. it initializes using the internal antenna on l1 only. accuracy with ntrip correction can be to centimeter level, but in practice this is difficult to reach because you cannot easily hold the antenna of the data collector exactly above a point. an rtk solution with the gps+ module of topsurv which also brings you centimeter accuracy, via ntrip correction from a local supplier. in this case of course you want to use the external pg-a1 (gps& glonass l1+l2) antenna. this fourth option is basically the same as the rover i normally use, but now all the technology is in the data collector, while in my own set almost all the technology is in the gps receiver which is at the top of the pole. so this solution is a lot better from the weight and location of weight point of view, because now there is not so much weight at the top end of the pole. in fact, the grs-1 solution is the same as an rtk backpack solution without the backpack, since everything which used to be in the backpack is now in the grs-1. [b] instrument how do you fit a full working gnss system into a small case? the antenna and receiver unit is not difficult, but the pole normally is. but this pole also fit into the case. taking out the pole reminded me of setting up the tent the week before. the pole consists of six parts held together by an elastic. screwing the six parts together gives you a two meter pole because the diameter of the pole is a bit smaller than that of a normal pole, a small ring, which has the same outside diameter as a normal pole, is on the pole. here you have to pay attention because this ring can slide down the pole and, before you know it, it is gone. charger and communication cables are all in latest news? visit www.geoinformatics.com fig. 2 [a]. [d] [c] figure 2a: the build-in camera, with on the left side the macro switch. 2b: example of a macro picture of a fly. 2c: example of picture. 2d: example of picture 19 september 2009
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