{"id":2483,"date":"2016-11-07T18:45:33","date_gmt":"2016-11-07T18:45:33","guid":{"rendered":"\/?post_type=ht_kb&#038;p=2483"},"modified":"2018-03-04T18:53:51","modified_gmt":"2018-03-04T18:53:51","slug":"zero-zero-in-a-caster-table","status":"publish","type":"ht_kb","link":"https:\/\/www.use-snip.com\/kb\/knowledge-base\/zero-zero-in-a-caster-table\/","title":{"rendered":"Zero, Zero in a Caster Table"},"content":{"rendered":"<p>There are several times when the latitude &#8211; longitude of a Caster table entry may be the value 0,0 [zero, zero].\u00a0 This article discuses when this may occur and how the graphical map in <span style=\"color: #0000ff;\"><strong>SNIP<\/strong><\/span> deals with it when there is more than one such entry.<\/p>\n<p>The caster table serves as a guide for help the NTRIP Clients select which data stream they need.\u00a0 The locations given are somewhat crude (within a ~1km), any for many for virtual reference stations, or may not be be given at all.\u00a0\u00a0 [The actual location given is not used in the navigation process]\u00a0 This is by far the most common reason to see a map with one or more location displayed at the prime meridian and the equator.<\/p>\n<p>Other common reasons for\u00a0zero-zero points include:<\/p>\n<ul>\n<li>Never having set the actual latitude &#8211; longitude in a caster table entry. This may occur when the operator has not fully or correctly provided the caster details.\u00a0 In <span style=\"color: #0000ff;\"><strong>SNIP<\/strong><\/span> these details are set with the <a href=\"\/kb\/knowledge-base\/editing-caster-entries\/\"><strong>Caster Table Data Entry<\/strong><\/a> dialog. [<span style=\"color: #0000ff;\"><strong>SNIP<\/strong><\/span> will also detect and automatically correct this for other data streams if the stream is a parsed RTCM 3 type]<\/li>\n<li>Relaying a data stream before the caster stream is available. [A transitory event during the first tens of seconds when a data stream is initially starting and before its remote caster data is recovered and used by <span style=\"color: #0000ff;\"><strong>SNIP<\/strong><\/span>]<\/li>\n<li>A data stream where presenting a physical location makes no actual sense. [Such as a stream with world-wide orbital corrections]<\/li>\n<\/ul>\n<p>Because all of these can occur, there can be times when more then one reference station is shown at location zero-zero.\u00a0 When this occurs, the visual effect is a set of overlapping dots in the Gulf of Guinea south of the Ghana (where the prime median and the equator meet).\u00a0 This makes it very hard to examine the individual mountPt by further clicking on them.\u00a0 On most maps found on common NTRIP Client vendors (such as RTKLIB or BNC) and also in SNIP, the display presents some overlapping text.<\/p>\n<p><a href=\"\/kb\/wp-content\/uploads\/2016\/11\/ZeroZero.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2478 size-full\" src=\"\/kb\/wp-content\/uploads\/2016\/11\/ZeroZero.png\" alt=\"zerozero\" width=\"417\" height=\"479\" srcset=\"https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZero.png 417w, https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZero-261x300.png 261w, https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZero-44x50.png 44w, https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZero-320x368.png 320w\" sizes=\"auto, (max-width: 417px) 100vw, 417px\" \/><\/a><\/p>\n<p>In <span style=\"color: #0000ff;\"><strong>SNIP<\/strong><\/span> some minor additional logic is also implemented when multiple reference stations are found to be at the zero-zero point.\u00a0\u00a0 When this occurs, <span style=\"color: #0000ff;\"><strong>SNIP<\/strong><\/span> simply adjusts their displayed position on the map by a few km so that (when zoomed in) they no longer overlap.\u00a0 The display logic simply adjusted the latitude and longitude values by small amount to offset each point.\u00a0 By doing this the user can right-click on the mountPt of interest and examine its details further.\u00a0\u00a0\u00a0 Here is an example of this effect with nine data streams that would otherwise overlap.<\/p>\n<p><a href=\"\/kb\/wp-content\/uploads\/2016\/11\/ZeroZeroCloseUp2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2479 size-full\" src=\"\/kb\/wp-content\/uploads\/2016\/11\/ZeroZeroCloseUp2.png\" alt=\"zerozerocloseup2\" width=\"414\" height=\"484\" srcset=\"https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZeroCloseUp2.png 414w, https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZeroCloseUp2-257x300.png 257w, https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZeroCloseUp2-43x50.png 43w, https:\/\/www.use-snip.com\/kb\/wp-content\/uploads\/2016\/11\/ZeroZeroCloseUp2-320x374.png 320w\" sizes=\"auto, (max-width: 414px) 100vw, 414px\" \/><\/a><\/p>\n<p><strong>See also<\/strong>: <a href=\"\/kb\/knowledge-base\/caster-locations-vs-base-station-locations\/\">this article<\/a> on the differences between the published caster location and the precise base station location and how these can resulting in different map display details.<\/p>\n<p><strong>See also<\/strong>: <a href=\"\/kb\/knowledge-base\/support-for-basic-mapping\/\">this article<\/a> on the basic map display functions in <span style=\"color: #0000ff;\"><strong>SNIP<\/strong><\/span>.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are several times when the latitude &#8211; longitude of a Caster table entry may be the value 0,0 [zero, zero].\u00a0 This article discuses when this may occur and how the graphical map in SNIP deals with it when there is more than one such entry. The caster table serves [&hellip;]<\/p>\n","protected":false},"author":13,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"ht-kb-category":[285,112],"ht-kb-tag":[235,13,258],"class_list":["post-2483","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-base-station-setup","ht_kb_category-general","ht_kb_tag-caster","ht_kb_tag-location","ht_kb_tag-zero-zero"],"_links":{"self":[{"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/ht-kb\/2483","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/comments?post=2483"}],"version-history":[{"count":10,"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/ht-kb\/2483\/revisions"}],"predecessor-version":[{"id":4142,"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/ht-kb\/2483\/revisions\/4142"}],"wp:attachment":[{"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/media?parent=2483"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/ht-kb-category?post=2483"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/www.use-snip.com\/kb\/wp-json\/wp\/v2\/ht-kb-tag?post=2483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}